Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 68

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Four lenses of focal length $\pm 15 c m$ and $\pm 150 c m$ are available for making a telescope. To produce the largest magnification, the focal length of the eyepiece should be :

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Important Questions on Ray Optics and Optical Instruments

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 69

A lens is placed between a source of light and a wall. It forms images of area

A_{1}

and

A_{2}

on the wall, for its two different positions. The area of the source of light is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 70

If

f_{V}

and

f_{R}

are the focal length of a convex lens for violet and red light respectively and

F_{V}

and

F_{R}

are the focal length of a concave lens for violet and red light respectively, then we must have

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 71

If a convex lens of focal length

80 c m

and a concave lens of focal length

50 c m

are combined together, what will be their resulting power?

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 72

The focal length of a converging lens is measured for violet, green and red colours. It is respectively

f_{v}, f_{g}, f_{r}

. We will get

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 73

A luminous object is placed at a distance of

30 cm

from the convex lens of focal length

20 cm

. On the other side of the lens, at what distance from the lens a convex mirror of radius of curvature

10 cm

be placed in order to have an image of the object coincident with it?

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 74

A plano-convex lens is made of refractive index

1.6

. The radius of curvature of the curved surface is

60 cm

. The focal length of the lens is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 75

A planoconvex lens

(μ = 1.5)

has radius of curvature

10 cm

. It is silvered on its plane surface. Find focal length after silvering

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 76

A bubble in glass slab

(μ = 1.5)

when viewed from one side appears at

5 cm

and

2 cm

from other side, then thickness of slab is