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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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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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 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-

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 5

Dispersive power of a prism depends on

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 6

A spherical convex surface of radius of curvature

\frac{2}{9} m

separates two media of refractive index

\frac{4}{3}

and

\frac{3}{2} .

If an object is kept in first medium at infinity then the position of image from spherical surface is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 7

One face of prism with refracting angle

37 °

is coated with silver. A light ray incident on other face at angle

60 °

is refracted and reflected back from the silver coated face such that it retraces its path. The refractive index of prism is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 8

A point object is moving with speed $8 cm / s$ in front of a converging lens along the principle axis as shown in figure. At this instant speed of image is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 9

A compound microscope has an objective of focal length

2 cm

and an eye-piece of focal length

5 cm .

An object is placed at a distance

2.4 cm

in front of objective lens. If final image forms at infinity then magnifying power and corresponding tube length of microscope are respectively

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 10

A double convex lens of refractive index

\frac{3}{2}

has radii of

30 cm .

Incident rays of light parallel to principal axis will come to converge at a distance from the lens is

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]

Important Questions on Ray Optics and Optical Instruments

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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 $25 cm$ ]