Why does diamong sparkle?

The diamond has a very high refractive index 2 . 45 and hence low critical angle (about 24 ° ) Apart from this, it is cut in a special manner so that most of the light incident on it any internal faces have a higher angle of incidence than its critical angle This makes the light suffers multiple internal reflections from its inner faces. This makes the diamond shine.

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 33

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When a telescope is adjusted for normal vision, the distance of the objective from the eye-piece is found to be $80 cm .$ The magnifying power of the telescope is $19 .$ What are the focal lengths of the lenses ?

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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 34

The focal lengths of the objective and eye lenses of a telescope are respectively

200 cm

and

5 cm

. The maximum magnifying power of the telescope will be

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assigment>Q 25

Rainbows are classic example of the phenomenon of

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 1

A ray of light is incident at an angle of

60 °

on a prism of refracting angle

60 ° .

If refractive index of the material of the prism is

\sqrt{3},

then angle between incident ray and emergent ray will be

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 2

The focal length of the eyepiece and the objective of an astronomical telescope are

4 cm

and

50 cm

respectively. The length of the telescope for the adjustment in which eye is most strained will be about [least distance of distinct vision is

25 cm

]

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 3

Light takes time

(t_{1})

to travel a distance

a

in medium (1) and takes time (

t_{2}

) to travel a distance

b

in a medium

(2)

. The critical angle for the pair of medium is [medium

(2)

is denser than medium

(1)

].

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 4

Diameter of plano-convex lens is $6 cm$ and thickness at the centre is $3 mm$ . If speed of light in material of lens is $2 \times 10^{8} m s^{- 1}$ , the focal length of the lens is-