EASY

Earn 100

Explain paraxial approximation.

Important Questions on Reflection of Light at Curved Surfaces

HARD

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

An object is placed at a distance of

5 cm

more than the focal length

f

of a convex lens. Its real image is formed at a distance

3 f

beyond the focus. The focal length

f

of the lens is:

MEDIUM

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

A square card of side length

1 m m

is being seen through a magnifying lens of focal length

10 c m

. The card is placed at a distance of

9 c m

from the lens. The apparent area of the card through the lens is:

MEDIUM

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

Light from a point source in air falls on a convex spherical glass surface whose radius of curvature and refractive index are

20 c m

and

1.5

respectively. If the distance of light source from the glass surface is

100 c m

, then the position of image will be formed at:

EASY

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

Which of the following is the Lens maker’s formula?

MEDIUM

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

A man is trying to start a fire by focusing sunlight on a piece of paper using an equi-convex lens of focal length

10 c m

. The diameter of the sun is

1.39 \times 10^{9} m

and its mean distance from the earth is

1.5 \times 10^{11} m

. The diameter of the sun's image on the paper is (close to)

HARD

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

A convex lens of focal length

0.2 c m

and made of glass

(^{a} μ_{w} = 1.5)

is immersed in water

(^{a} μ_{w} = 1.33)

. Find the change in the focal length of the lens.

HARD

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

The focal length of a convex lens of glass of refractive index

1.50

2 cm

. The focal length of the lens when immersed in a liquid of refractive index

1.25

will be:

MEDIUM

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

A real image of an object is formed at a distance of

20 c m

from a lens. On putting another lens in contact with it, image is shifted

10 c m

towards the combination. The power of the lens is _____

D

MEDIUM

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

Radii of curvature of a converging lens are in the ratio

1 : 2

. Its focal length is

6 c m

and refractive index is

1.5

. Then its radii of curvature are:

MEDIUM

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

A person with normal near point

25 c m

uses a compound microscope with an objective of focal length

8.0 m m

and an eyepiece of focal length

2.5 c m

to bring an object placed at

9.0 m m

from the objective in sharp focus. The separation between two lenses and magnification respectively are

EASY

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

Choose the correct option.

A spherical marble, of refractive index $1.5$ and curvature $1.5 cm$ , contains a tiny air bubble at its centre. Where will it appear when seen from outside?

EASY

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

An object is placed at a distance of

1.5 m

from the screen and a convex lens is interposed between them. The magnification produced is

4

. What is the focal length of the lens.

EASY

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then, it's focal length will:

MEDIUM

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

The radius of curvature of each surface of a convex lens of refractive index

1.5

40 c m

. Calculate the power of this lens.

HARD

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

From a point source, light falls on a spherical glass surface

(μ = 1.5

and radius of curvature

= 10 c m)

. The distance between point source and glass surface is

50 c m

. The position of the image is

MEDIUM

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

The refractive index of material of a Plano-convex lens, if the radius of curvature of the plane surface

(R_{1})

is infinite while the radius of curvature of convex surface

(R_{2})

20 c m

and focal length of the lens is

30 c m

, will be:

MEDIUM

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

A real image of an object is formed at a distance of

20 c m

from a lens. On putting another lens in contact with it, image is shifted

10 c m

towards the combination. The power of the lens is _____

D

EASY

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

A plano-convex lens has refractive index

μ_{1}

and focal length

f_{1}

and another plano-concave lens has refractive index

μ_{2}

and focal length

f_{2}

. Radius of curvature in both lenses is same. If

f_{1} = 2 f_{2}

then relation between

μ_{1}

and

μ_{2}

EASY

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

The radius of curvature of each surface of a convex lens of refractive index

1.5

40 c m

. Calculate the power of this lens.

EASY

Science>Physics>Reflection of Light at Curved Surfaces>Refraction of Light at Curved Surface

A double convex lens of refractive index

1.47

is immersed in a liquid. It behaves like a plane sheet. It means the refractive index of the liquid is-

Explain paraxial approximation.

Important Questions on Reflection of Light at Curved Surfaces

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