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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In case of displacement method of lenses, the product of magnification in both cases 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 35

In the displacement method, a convex lens is placed in between an object and a screen. If the magnifications in the two positions are

m_{1}

and

m_{2}

and the displacement of the lens between the two, positions is

x,

then 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 36

The focal length of a planoconvex glass lens is

20 cm (μ_{g} = 1.5) .

The plane face of it is silvered. An illuminating object is placed at a distance of

60 cm

from the lens on its axis along the convex side. Then the distance (in

cm

) of the image is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 37

Two thin similar convex glass pieces are joined together front to front with its rear portion silvered such that a sharp image is formed $20 cm$ from the mirror. When the air between the glass pieces is replaced by water $(μ_{w} = \frac{4}{3}),$ then the image formed from the mirror is at a distance of

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 38

A convex lens forms a real image of a point object at a distance of

50 cm

from the convex lens. A concave lens is placed

10 cm

behind the convex lens on the image side. On placing a plane mirror on the image side and facing the concave lens, it is observed that the final image now coincides with the object itself. The focal length of the concave lens is

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 39

An isosceles prism of angle $A = 30 °$ has one of its surfaces silvered. Light rays falling at an angle of incidence $60 °$ on the other surface retrace their path after reflection from the silvered surface. The refractive index of prism material is

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