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 10

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An equi-convex lens of focal length $40 cm$ is cut vertically into two equal halves as shown in figure. The new magnitude of focal length of each part of lens will be

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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 11

Which of the following alternatives is correct for a prism placed in a position of minimum deviation? (Symbols have their usual meanings)

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

Mirror formula is given as

\frac{1}{v}

_____

\frac{1}{u} = \frac{1}{f}

.

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 13

Focal length of a plane mirror is _____.

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 14

Angle of deviation on refraction is

δ = | i

_____

r |

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 15

Total internal reflection is obtained when ray passes from _____ to rarer medium.

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 16

When image is formed at _____ then angular magnification simple microscope is given as

m = \frac{D}{f}

.

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 17

What is the use of erecting lens in a terrestrial telescope? What is its magnification?

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Gamma Question Bank for Medical Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 18

For the same angle of incidence, the angle of refraction in three different media A, B and C are $10 °, 25 °$ and $40 °$ , respectively. In which medium the velocity of light will be maximum?