Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 11

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A monochromatic light passes through a glass slab $(μ = \frac{3}{2})$ of thickness $90 cm$ in time $t_{1} .$ If it takes a time $t_{2}$ to travel the same distance through water $(μ = \frac{4}{3}) .$ The value of $(t_{1} - t_{2})$ is

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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>EXERCISE>Q 12

A beam of light is partially reflected and partially refracted from a surface. The angle between reflected and refracted light ray is

90 ° .

If the angle of refraction is

30 °,

the angle of incidence is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 13

A small object is placed

20 cm

in front of a block of glass

10 cm

thick and its farther side silvered. The image is formed

22 cm

behind the silvered face. Find the refractive index of glass.

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 14

A glass slab of thickness

4 cm

contains the same numbers of waves as

5 cm

of water when both are traversed by the same monochromatic ray of light. The refractive index of water is

\frac{4}{3}

, what is that for glass?

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 15

Light travels with velocities

2 \times 10^{8} m s^{- 1}

and

2.5 \times 10^{8} m s^{- 1}

through two different media. The critical angle of the two media is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 16

Light takes

t_{1}

second to travel a distance

x

in vacuum and the same light takes

t_{2}

second to travel

10 x cm

in a medium. Critical angle for corresponding medium will be

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 17

A fish is a little away below the surface of a take. If the critical angle is

49 °,

then the fish could see things above the water surface within an angular range of

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 18

A parallel beam of monochromatic light falls on a combination of a convex lens and a concave lens of focal lengths

15 cm

and

5 cm

respectively. What is the distance between the two lenses to obtain a parallel beam of light from the concave lens?

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE>Q 19

Three lenses in contact have a combined focal length of

12 cm .

When the third lens is removed, the combined focal length is

\frac{60}{7} cm .

The third lens is