What are the differences between concave and convex lens. In this lesson we discuss about the uses of concave & convex mirrors. Sign up now to enroll in courses, follow best educators, interact with the community and track your progress., About This Quiz & Worksheet. Use this quiz and worksheet to gauge your comprehension of a concave lens. Topics you'll need to understand include uses for lenses and types of lenses..

### Uses of Concave and Convex Mirror (in Hindi Unacademy

Difference Between Concave and Convex Lens Pediaa.Com. So, the point of focus in case of the convex lens is the point where all the light rays meet, i.e. point of convergence, but if we talk about the concave lens, the focal point is the point from where the light rays seem to diverge, i.e. point of divergence., 18/12/2018В В· OBSERVE What are the uses of concave and convex lens? LIST OF RELATED VIDEOS OF What are the uses of concave and convex lens? IN THIS CHANNEL : What is the n... LIST OF RELATED VIDEOS OF What are.

1 Concave and convex functions 1.1 Convex Sets Deп¬Ѓnition 1 A set X вЂ° Rn is called convex if given any two points x0; x00 2 X the line segment joining x0 and x00 completely belongs to X, in other words for each t 2 [0;1] the point xt = (1 ВЎt)x0 +tx00 is also in X for every t 2 [0;1]. The intersection of convex sets is convex. The union of convex sets is not necessarily convex. Let X вЂ° Rn Yes, a single convex lens is a telescope, as your diagrams show, but only if the lens is held away from your eye, and the image in the lens appears inverted. Notice: the focal length of the lens must be significantly smaller than the length of your arm!!

A simple convex lens can focus light into an image, but that image won't be very high quality with a lens made with a single lens. To correct for distorting and aberrations, combining groups of both concave and convex lenses can be used. In ordinary usage, concave and convex are typically used when referring to glass surfaces, like the lenses of optical viewing equipment. The side mirror of a car has a concave surface. The inside surface of most eyeglasses is concave.

Hii. Curving inward, concave lenses cause light to spread out, resulting in a smaller image for the viewer. Despite being less useful than convex lenses, concave lenses have several uses, including in eyeglasses and contacts, flashlights, peepholes, binoculars, telescopes, and in photography. Yes, a single convex lens is a telescope, as your diagrams show, but only if the lens is held away from your eye, and the image in the lens appears inverted. Notice: the focal length of the lens must be significantly smaller than the length of your arm!!

A concave lens will always produce diminished, upright and virtual image of the object in front of it. But the nature of the image produced by a these lens depends upon the position of the object. It can form both real and virtual images depending on where the light is coming from. Let's look at the four combinations of virtual/real convex/concave lenses for a single lens: Convex, real image If the object is located outside the focal length of the lensвЂ¦

(c) Place the thinner convex lens about 10cm from the front of the light box and align it so that the central ray passes straight through it. (d) вЂњRay TraceвЂќ the 3 incident and refracted rays and note the spot where the refracted 1" "! Ozobot Bit Classroom Application: Demonstration of the Optics of Thin Convex and Concave Lenses By Richard Born Associate Professor Emeritus

Curved, or spherical, mirrors are also known as concave and convex mirrors. Calculations about the images formed by these lenses are based on the assumption that the curved section of the mirror was sliced off of a sphere. A lens that is convex on both sides should really be called bi-convex and one that is concave on both sides is bi-concave. The meniscus lens behaves as either a convex or a concave lens depending on which side is the more sharply curved.

A lens that is convex on both sides should really be called bi-convex and one that is concave on both sides is bi-concave. The meniscus lens behaves as either a convex or a concave lens depending on which side is the more sharply curved. 18/03/2013В В· The convex lens is also called a converging lens and the concave lens is also called a the diverging lens. The images formed by the lenses are of two types: real image and the virtual image.

Concave Lens: (1) The reflecting surface of the concave mirror is bulged inwards. (2) Concave mirror produces real and inverted images (except when the object is placed between pole and focus. by Natasha Cooke-Nieves. In this lesson, students will be able to explain how convex lenses cause rays of light to converge (come together) at a single point and how concave вЂ¦

### EXPERIMENT 6 OPTICS FOCAL LENGTH OF A LENS

Concave and Convex Lens (Optics) Glass Engineering And. The difference between convex and concave mirror is explained hereunder: The type of spherical mirror whose reflecting surface is bulged outwards, in the sense that its face is opposite to the centre of the sphere is known as a convex mirror., Convex lenses are converging lenses, and concave lenses are diverging lenses. See diagram below. A convex lens gives a real, inverted image if the object is outside the focal length of the lens. It will give a virtual upright image if the object is within the focal length. A concave lens gives a virtual upright image. concave i o convex i f o i o f Accompanying sheet Lenses вЂ“ Concave and.

Convex Lens Definition & Uses Difference Between. You will use the double concave fens-and-double convex lens yw& Note: As you work through both parts of this assignment, pay close attention to the marks assigned. For example, a 4-mark question will require a more extensive or detailed response than a 1-mark question., 1 Concave and convex functions 1.1 Convex Sets Deп¬Ѓnition 1 A set X вЂ° Rn is called convex if given any two points x0; x00 2 X the line segment joining x0 and x00 completely belongs to X, in other words for each t 2 [0;1] the point xt = (1 ВЎt)x0 +tx00 is also in X for every t 2 [0;1]. The intersection of convex sets is convex. The union of convex sets is not necessarily convex. Let X вЂ° Rn.

### Convex & Concave Lenses Pass My Exams Easy exam

What are Concave and Convex Mirrors? A Plus Topper. Concave lens, when combined with the convex lenses, give sharper images.Most eyeglass lenses have combinations of concave and convex. In modern world eyeglasses allow millions of people to see and read comfortably. Cameras, telescopes, and microscopes which use different lens helping us to see the world in a better way. You will use the double concave fens-and-double convex lens yw& Note: As you work through both parts of this assignment, pay close attention to the marks assigned. For example, a 4-mark question will require a more extensive or detailed response than a 1-mark question..

Concave lenses are used for correcting myopia or short-sightedness. Convex lenses are used for focusing light rays to make items appear larger and clearer, such as with magnifying glasses. A concave lens contains at least one inwardly-curved surface, and it is also referred to as a divergent lens by Natasha Cooke-Nieves. In this lesson, students will be able to explain how convex lenses cause rays of light to converge (come together) at a single point and how concave вЂ¦

Question:A)Because a concave lens cannot form a real image of a real object, it is difficult to measure its focal length precisely. One method uses a second, convex, lens to produce a virtual object for the concave lens. (c) Place the thinner convex lens about 10cm from the front of the light box and align it so that the central ray passes straight through it. (d) вЂњRay TraceвЂќ the 3 incident and refracted rays and note the spot where the refracted

Camera manufacturers use combinations of concave and convex lenses to improve the quality of photographs. The primary lens of a camera is convex, and when used alone, it can cause distortions in the photographs called chromatic aberrations. Similar to how a concave mirror works in a microscope, the concave mirror in the telescope collects light. Instead of shining the light up to a specimen, it shines the light from distant stars onto a flat mirror. The viewer looks through the lens on the eyepiece of the telescope and sees the reflection on the mirror, allowing a view of stars that the naked eye is unable to see.

Applications of Convex Mirrors Microscope Under vehicle search mirrors Rear view mirror Security at Hospitals, shopping areas At Blind turns What is the convex mirror used on roads called? Applications of Concave Mirrors Solar concentrator Makeup uses the index of refraction nof the lens material and the radii of curvature of both surfaces to predict the focal length of a convex, concave, plano-convex or plano-concave lens. It assumes that the lens thickness d can be treated as insigniп¬Ѓcant and the lens is surrounded by air. The Gaussian sign convention indicates that for a double-convex lens, R2 is negative and for a double-concave

CONCAVE or NEGATIVE lenses will DIVERGE (spread out) light rays You can have mixed lens shapes too: See a demonstration (opens a new window) of what happens to the light path when you combine several convex or concave lenses. In this lesson we discuss about the uses of concave & convex mirrors. Sign up now to enroll in courses, follow best educators, interact with the community and track your progress.

The Lightbox uses LASER (class 2) radiation which is harmful to the eyes. LENSES, CONVEX & CONCAVE Page !4 of !11 DEBORAH SAND Switch вЂ“ 1 beam / вЂ¦ Convex mirrors are often used on vehicular rear-view mirrors. On cars, the passenger mirror is often a convex mirror, and will be labeled that objects appear smaller in the mirror, and are closer, because of the convex mirror physics. On larger truck mirrors, there is often a circular convex mirror mounted on the plane mirror, for wider angle viewing.

CONCAVE or NEGATIVE lenses will DIVERGE (spread out) light rays You can have mixed lens shapes too: See a demonstration (opens a new window) of what happens to the light path when you combine several convex or concave lenses. The Lightbox uses LASER (class 2) radiation which is harmful to the eyes. LENSES, CONVEX & CONCAVE Page !4 of !11 DEBORAH SAND Switch вЂ“ 1 beam / вЂ¦

Image Formation By Convex Lens in Different Cases. Case 1: Object at Infinity A point object lying on the principal axis: Rays come parallel to the principal axis and after refraction from the lens, actually meet at the second principal focus F 2. Curved, or spherical, mirrors are also known as concave and convex mirrors. Calculations about the images formed by these lenses are based on the assumption that the curved section of the mirror was sliced off of a sphere.

A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex (bulging outwards) or concave (bulging inwards). Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices. You will use the double concave fens-and-double convex lens yw& Note: As you work through both parts of this assignment, pay close attention to the marks assigned. For example, a 4-mark question will require a more extensive or detailed response than a 1-mark question.

## Light Lesson Concave n Convex Lenses Lens (Optics

Difference Between Convex and Concave Mirror (with. In this lesson we discuss about the uses of concave & convex mirrors. Sign up now to enroll in courses, follow best educators, interact with the community and track your progress., Convex lens which is also called as a converging lens or positive lens is thicker at the middle. The light rays that pass through a convex lens converge or are brought closer together. There are various uses of convex lens like in a microscope, magnifying glasses, camera, correction of hypermetropia, etc..

### state uses of a concave lens Brainly.in

Uses of concave and convex lenses science.answers.com. Yes, a single convex lens is a telescope, as your diagrams show, but only if the lens is held away from your eye, and the image in the lens appears inverted. Notice: the focal length of the lens must be significantly smaller than the length of your arm!!, (c) Place the thinner convex lens about 10cm from the front of the light box and align it so that the central ray passes straight through it. (d) вЂњRay TraceвЂќ the 3 incident and refracted rays and note the spot where the refracted.

Uses of concave mirror. The concave mirror is a converging mirror, so that it is used for many purposes , It is used as a torch to reflect the light, It is used in the aircraft landing at the airports to guide the aeroplanes , It is used in shaving to get an enlarged and erect image of the face . Uses of Convex Lens,Concave Lens,Convex Mirrors,Concave Mirrors Lenses and Mirrors Applications Study for Exams - Optics,Physics S.I unit of power of lens: Dioptre.

1" "! Ozobot Bit Classroom Application: Demonstration of the Optics of Thin Convex and Concave Lenses By Richard Born Associate Professor Emeritus Applications of Convex Mirrors Microscope Under vehicle search mirrors Rear view mirror Security at Hospitals, shopping areas At Blind turns What is the convex mirror used on roads called? Applications of Concave Mirrors Solar concentrator Makeup

by Natasha Cooke-Nieves. In this lesson, students will be able to explain how convex lenses cause rays of light to converge (come together) at a single point and how concave вЂ¦ A lens that is convex on both sides should really be called bi-convex and one that is concave on both sides is bi-concave. The meniscus lens behaves as either a convex or a concave lens depending on which side is the more sharply curved.

13 -Convex and Concave lenses вЂўLevel 4 - Show how lenses bend light using ray diagrams. вЂўLevel 5 - Explain how a camera lens works вЂўLevel 6 - Relate the shape of a lens to the type of Microscopes have a convex lens and a concave mirror and a flat mirror to magnify small images on a slide. Telescopes use convex lenses. The University of Virginia's Biology Department notes that refracting telescopes use two convex lenses and reflecting telescopes use convex and concave lenses and a flat mirror to magnify.

Convex surfaces have positive power, concave surfaces have negative power, and flat surfaces have zero power. The total lens power is the sum of the power of the two surfaces. Convex lenses are converging lenses, and concave lenses are diverging lenses. See diagram below. A convex lens gives a real, inverted image if the object is outside the focal length of the lens. It will give a virtual upright image if the object is within the focal length. A concave lens gives a virtual upright image. concave i o convex i f o i o f Accompanying sheet Lenses вЂ“ Concave and

NOTE: Concave and Convex lenses have only one flat edge. Place flat edge on surface. Place flat edge on surface. Trace around the surface of the lens and trace the incident and transmitted rays. In ordinary usage, concave and convex are typically used when referring to glass surfaces, like the lenses of optical viewing equipment. The side mirror of a car has a concave surface. The inside surface of most eyeglasses is concave.

In this lesson we discuss about the uses of concave & convex mirrors. Sign up now to enroll in courses, follow best educators, interact with the community and track your progress. A simple convex lens can focus light into an image, but that image won't be very high quality with a lens made with a single lens. To correct for distorting and aberrations, combining groups of both concave and convex lenses can be used.

A simple convex lens can focus light into an image, but that image won't be very high quality with a lens made with a single lens. To correct for distorting and aberrations, combining groups of both concave and convex lenses can be used. For both concave and convex, mirrors, ray P and ray F can be reversed to travel back along the same path. This property is known as the reversibility of light . The point where any of the two construction lines cross or intersect is the position of the image formed by the curved mirrors.

d) Photograph of a convex (left) and a concave (right) lens chip after the dispensing process. Download Full Size PPT Slide PDF Figure 5 a) Surface characterization: Acquisition of the surface profile by white light interferometry yields the lens diameter D and the lens height h . A simple convex lens can focus light into an image, but that image won't be very high quality with a lens made with a single lens. To correct for distorting and aberrations, combining groups of both concave and convex lenses can be used.

Curved, or spherical, mirrors are also known as concave and convex mirrors. Calculations about the images formed by these lenses are based on the assumption that the curved section of the mirror was sliced off of a sphere. Concave lens D. Lens that is thicker in the middle than at the edge Focal point E. Distance from the centre of the lens to the focal point 2) Compare and contrast concave lenses and convex lenses.

Concave lenses are used for correcting myopia or short-sightedness. Concave lenses are used on flashlights to magnify the light produced by the bulb. Used in peepholes of house doors for security to provide a view of people or objects outside the doors. The Lightbox uses LASER (class 2) radiation which is harmful to the eyes. LENSES, CONVEX & CONCAVE Page !4 of !11 DEBORAH SAND Switch вЂ“ 1 beam / вЂ¦

For both concave and convex, mirrors, ray P and ray F can be reversed to travel back along the same path. This property is known as the reversibility of light . The point where any of the two construction lines cross or intersect is the position of the image formed by the curved mirrors. 13 -Convex and Concave lenses вЂўLevel 4 - Show how lenses bend light using ray diagrams. вЂўLevel 5 - Explain how a camera lens works вЂўLevel 6 - Relate the shape of a lens to the type of

The separation theorem uses linear functionals to describe closed convex sets. If a given vector is If a given vector is not in a closed convex set, then there is a вЂ¦ A concave lens is a diverging lens. When parallel rays of light pass through a concave lens the refracted rays diverge so that they appear to come from one point called the principal focus . The distance between the principal focus and the centre of the lens is called the focal length .

Basic Optics System Experiment 6: Convex and Concave Lenses 20 5. Nest the convex and concave lenses together and place them in the path of the parallel rays (see Figure 6.2). Microscopes have a convex lens and a concave mirror and a flat mirror to magnify small images on a slide. Telescopes use convex lenses. The University of Virginia's Biology Department notes that refracting telescopes use two convex lenses and reflecting telescopes use convex and concave lenses and a flat mirror to magnify.

Convex surfaces have positive power, concave surfaces have negative power, and flat surfaces have zero power. The total lens power is the sum of the power of the two surfaces. CONCAVE or NEGATIVE lenses will DIVERGE (spread out) light rays You can have mixed lens shapes too: See a demonstration (opens a new window) of what happens to the light path when you combine several convex or concave lenses.

So, the point of focus in case of the convex lens is the point where all the light rays meet, i.e. point of convergence, but if we talk about the concave lens, the focal point is the point from where the light rays seem to diverge, i.e. point of divergence. Curved, or spherical, mirrors are also known as concave and convex mirrors. Calculations about the images formed by these lenses are based on the assumption that the curved section of the mirror was sliced off of a sphere.

A convex lens focuses light rays, whereas a concave lens causes the light rays to diverge. A lens can be defined as a transparent material (like a glass) that has either an open curved surface or one flat surface or two curved surfaces. A concave mirror is a spherical mirror in which the reflecting surface and the center of curvature fall on the same side of the mirror. On the other hand, a convex mirror is a spherical mirror in which the reflecting surface and the center of curvature lie on the opposite sides of the mirror.

state uses of a concave lens Brainly.in. A concave lens will always produce diminished, upright and virtual image of the object in front of it. But the nature of the image produced by a these lens depends upon the position of the object. It can form both real and virtual images depending on where the light is coming from., You will use the double concave fens-and-double convex lens yw& Note: As you work through both parts of this assignment, pay close attention to the marks assigned. For example, a 4-mark question will require a more extensive or detailed response than a 1-mark question..

### Uses of Concave Lens and its Applications in everyday life

optics Why can't concave lenses be used as magnifying. d) Photograph of a convex (left) and a concave (right) lens chip after the dispensing process. Download Full Size PPT Slide PDF Figure 5 a) Surface characterization: Acquisition of the surface profile by white light interferometry yields the lens diameter D and the lens height h ., Hii. Curving inward, concave lenses cause light to spread out, resulting in a smaller image for the viewer. Despite being less useful than convex lenses, concave lenses have several uses, including in eyeglasses and contacts, flashlights, peepholes, binoculars, telescopes, and in photography..

### Simple Uses of Concave Mirrors Sciencing

What are Concave and Convex Mirrors? A Plus Topper. Camera manufacturers use combinations of concave and convex lenses to improve the quality of photographs. The primary lens of a camera is convex, and when used alone, it can cause distortions in the photographs called chromatic aberrations. (c) Place the thinner convex lens about 10cm from the front of the light box and align it so that the central ray passes straight through it. (d) вЂњRay TraceвЂќ the 3 incident and refracted rays and note the spot where the refracted.

Of the two types of lenses (convex and concave), the concave lenses are used less frequently. Curving inward, concave lenses cause light to spread out, resulting in a smaller image for the viewer by Natasha Cooke-Nieves. In this lesson, students will be able to explain how convex lenses cause rays of light to converge (come together) at a single point and how concave вЂ¦

d) Photograph of a convex (left) and a concave (right) lens chip after the dispensing process. Download Full Size PPT Slide PDF Figure 5 a) Surface characterization: Acquisition of the surface profile by white light interferometry yields the lens diameter D and the lens height h . About This Quiz & Worksheet. Use this quiz and worksheet to gauge your comprehension of a concave lens. Topics you'll need to understand include uses for lenses and types of lenses.

1 Concave and convex functions 1.1 Convex Sets Deп¬Ѓnition 1 A set X вЂ° Rn is called convex if given any two points x0; x00 2 X the line segment joining x0 and x00 completely belongs to X, in other words for each t 2 [0;1] the point xt = (1 ВЎt)x0 +tx00 is also in X for every t 2 [0;1]. The intersection of convex sets is convex. The union of convex sets is not necessarily convex. Let X вЂ° Rn Cameras make use of numerous lens elements (some convex, some concave) in series. In summary, concave and convex lenses have many uses in day-to-day life, but most of these involve some combination of the two, as well as -- perhaps -- prisms and curved or planar mirrors.

So, the point of focus in case of the convex lens is the point where all the light rays meet, i.e. point of convergence, but if we talk about the concave lens, the focal point is the point from where the light rays seem to diverge, i.e. point of divergence. by Natasha Cooke-Nieves. In this lesson, students will be able to explain how convex lenses cause rays of light to converge (come together) at a single point and how concave вЂ¦

De nition 3.1.2 [Closed convex function] A convex function f is called closed if its epi- graph is a closed set. Note that the function which is convex and continuous on a closed domain is a closed Basic Optics System Experiment 6: Convex and Concave Lenses 20 5. Nest the convex and concave lenses together and place them in the path of the parallel rays (see Figure 6.2).

A convex lens is known as a converging lens, whereas a concave lens is also known as a diverging lens. Concave and convex are also two types of spherical mirrors. A concave mirror is a spherical mirror in which the reflecting surface and the center of curvature fall on the same side of the mirror. Concave lenses are used for correcting myopia or short-sightedness. Convex lenses are used for focusing light rays to make items appear larger and clearer, such as with magnifying glasses. A concave lens contains at least one inwardly-curved surface, and it is also referred to as a divergent lens

Applications of Convex Mirrors Microscope Under vehicle search mirrors Rear view mirror Security at Hospitals, shopping areas At Blind turns What is the convex mirror used on roads called? Applications of Concave Mirrors Solar concentrator Makeup Convex surfaces have positive power, concave surfaces have negative power, and flat surfaces have zero power. The total lens power is the sum of the power of the two surfaces.

13 -Convex and Concave lenses вЂўLevel 4 - Show how lenses bend light using ray diagrams. вЂўLevel 5 - Explain how a camera lens works вЂўLevel 6 - Relate the shape of a lens to the type of Convex - A convex lens is one where the center of the lens is thicker than the edges. Concave - A concave lens is one where the center of the lens is thinner than the edges. One way to remember the difference between the two lenses is to think of "caving in" with the concave lens.

Camera manufacturers use combinations of concave and convex lenses to improve the quality of photographs. The primary lens of a camera is convex, and when used alone, it can cause distortions in the photographs called chromatic aberrations. Concave lens D. Lens that is thicker in the middle than at the edge Focal point E. Distance from the centre of the lens to the focal point 2) Compare and contrast concave lenses and convex lenses.

About This Quiz & Worksheet. Use this quiz and worksheet to gauge your comprehension of a concave lens. Topics you'll need to understand include uses for lenses and types of lenses. Concave lens produces the same images as the convex mirror. The purpose of a lens is to let light through, a mirror's purpose is to bounce light backward. The "real

Similar to how a concave mirror works in a microscope, the concave mirror in the telescope collects light. Instead of shining the light up to a specimen, it shines the light from distant stars onto a flat mirror. The viewer looks through the lens on the eyepiece of the telescope and sees the reflection on the mirror, allowing a view of stars that the naked eye is unable to see. The difference between convex and concave mirror is explained hereunder: The type of spherical mirror whose reflecting surface is bulged outwards, in the sense that its face is opposite to the centre of the sphere is known as a convex mirror.

Basic Optics System Experiment 6: Convex and Concave Lenses 20 5. Nest the convex and concave lenses together and place them in the path of the parallel rays (see Figure 6.2). Concave lens, when combined with the convex lenses, give sharper images.Most eyeglass lenses have combinations of concave and convex. In modern world eyeglasses allow millions of people to see and read comfortably. Cameras, telescopes, and microscopes which use different lens helping us to see the world in a better way.

18/03/2013В В· The convex lens is also called a converging lens and the concave lens is also called a the diverging lens. The images formed by the lenses are of two types: real image and the virtual image. REFRACTION вЂ“ CONVEX AND CONCAVE LENSES PURPOSE: To explore the difference between convex and concave lenses and to determine their focal lengths. THEORY: Parallel rays of light passing through a thin convex lens cross at the focal point of the lens. The focal length is measured from the center of the lens to the focal point. MATERIALS: Ray Box (multiple white rays) Convex lens Concave lens

Uses of concave mirror. The concave mirror is a converging mirror, so that it is used for many purposes , It is used as a torch to reflect the light, It is used in the aircraft landing at the airports to guide the aeroplanes , It is used in shaving to get an enlarged and erect image of the face . Section 1: Introduction (Refraction and Lenses) 4 Convex (converging) and concave (diverging) lenses are drawn as, V W To understand image formation we use ray diagrams.

Camera manufacturers use combinations of concave and convex lenses to improve the quality of photographs. The primary lens of a camera is convex, and when used alone, it can cause distortions in the photographs called chromatic aberrations. (c) Place the thinner convex lens about 10cm from the front of the light box and align it so that the central ray passes straight through it. (d) вЂњRay TraceвЂќ the 3 incident and refracted rays and note the spot where the refracted

A convex lens focuses light rays, whereas a concave lens causes the light rays to diverge. A lens can be defined as a transparent material (like a glass) that has either an open curved surface or one flat surface or two curved surfaces. In this lesson we discuss about the uses of concave & convex mirrors. Sign up now to enroll in courses, follow best educators, interact with the community and track your progress.

Uses of Convex Lens,Concave Lens,Convex Mirrors,Concave Mirrors Lenses and Mirrors Applications Study for Exams - Optics,Physics S.I unit of power of lens: Dioptre. Concave lens. If the convex lens is replaced by a concave lens , the formed image can not be received on the screen , because the incoming rays diverge after refraction . When the position of the object is in front of the concave lens, The position of the image is before the object in the same side , The image formed by the concave lens is always virtual , erect and small . The concave lens is