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12th ICSE

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Can a convex (converging) lens behave as a concave (diverging) lens in some situation? Give example.

Important Questions on Refraction of Light at Spherical Surfaces : Lenses

EASY

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 14

A convex lens forms the image of the sun at a distance of

10 cm

. Where will the image be formed, if a lens of the same power but of double the aperture is used?

EASY

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 14

A convex lens forms the image of the sun at a distance of

10 cm

. Where will the image be formed, if a lens of the same aperture but of double the power is used?

MEDIUM

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 15

In the figure shown, $O$ is a point object placed in the air on the axis of a spherical surface $A P B$ of a glass block. $O A$ is an incident ray. The direction of the refracted ray $A D$ in the glass block is parallel to the principal axis $P C$ . $C P = C A = R$ is the radius of the spherical surface. Use the formula $\frac{n_{2}}{v} - \frac{n_{1}}{u} = \frac{n_{2} - n_{1}}{R}$ to show that the object distance $P O = u = \frac{R}{(n - 1)}$ ; where $n_{2} = n$ and $n_{1} = 1$ .

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12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 16

A monochromatic ray of light is incident on a spherical refracting surface of refractive index

n

. If

f_{1}

and

f_{2}

be the first and second focal lengths of the surface, show that

f_{2} + n f_{1} = 0

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12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 17

A thin lens has focal length

f

and its aperture has diameter

d

. It forms an image of intensity

I

. What will be its focal length and image intensity if the central part of the lens is blocked up to diameter

\frac{d}{2}

of the aperture by an opaque paper?

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12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 18

A convex lens $L$ and plane mirror $M$ are arranged as shown in figure. Position of the object pin $O$ is adjusted in such a way that the inverted image $I$ formed by the lens mirror combinations, coincides with the object pin $O$ . Explain how and when this happens.

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12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 19

A lens, whose radii of curvature are different, is forming the image of an object placed on its axis. If the lens is reversed, will the position of the image change?

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ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 20

The radii of curvature of both the surfaces of a convex lens are equal. Prove that the focal length of the lens will be equal to its radius of curvature if the refractive index of the material of the lens is

1.5

Can a convex (converging) lens behave as a concave (diverging) lens in some situation? Give example.

Important Questions on Refraction of Light at Spherical Surfaces : Lenses

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