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 4

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${\hat{n}}_{1}$ is the unit vector along incident ray, ${\hat{n}}_{2}$ along normal and ${\hat{n}}_{3}$ is the unit vector along reflected ray, then which of the following must be true ?

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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 5

Digital movie projectors work on the principle of

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

When a beam of light is incident on a plane mirror, it is found that a real image is formed. The incident beam must be

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

An object is placed symmetrically between two plane mirrors, inclined at an angle of

72 °,

then the total number of images observed is

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

A person

1.6 m

tall is standing at the centre between two walls three metre high. What is the minimum size of a plane mirror fixed on the wall in front of him, if he is to see the full height of the wall behind him ?

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

A person moves with a velocity

v

towards a plane mirror. With what velocity does his image move towards him ?

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

A glass slab (

μ = 1.5

) of thickness

2 cm

is placed on a spot. The shift of spot if it is viewed from top

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

Two parallel rays of red and violet colour passed through a glass slab, which of the following is correct ?

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 12

A plane glass is kept over a coloured word 'VIBGYOR', where colour of letters as same as the colours in white light start by letter, the letter which appears least raised is