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 18

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A ray is incident on boundary separating glass and water. Refractive index for glass is $\frac{3}{2}$ and refractive index for water is $\frac{4}{3}$ critical angle for glass-air boundary 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>Assignment>Q 19

A point object is situated at a distance of

36 cm

from the centre of the sphere of radius

12 cm

and refractive index

1.5 .

Locate the position of the image due to refraction through sphere.

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 20

A denser medium of refractive index

1.5

has a concave surface of radius of curvature

12 cm .

An object is situated in the denser medium at a distance of

9 cm

from the pole. Locate the image due to refraction in air.

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 21

In a medium of refractive index

1.6

and having a convex surface has a point object in it at a distance of

12 cm

from the pole. The radius of curvature is

6 cm .

Locate the image as seen from air

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 22

If radii of curvature of both convex surfaces is $20 cm,$ then focal length of the lens for an object placed in air in the given arrangement is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 23

Ray diagram for two lenses kept at some distance given in the diagram, which of the following option is correct $(f_{1}, f_{2} =$ focal length, $d =$ distance between lenses)

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