(C) The Assertion is correct because diamond has a very high refractive index $(n \approx 2.42)$,which results in a very small critical angle $(C \app

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(C) The Assertion is correct because diamond has a very high refractive index $(n \approx 2.42)$,which results in a very small critical angle $(C \approx 24.4^\circ)$.When light enters a diamond,it undergoes multiple internal reflections due to this small critical angle,causing it to glitter brilliantly.The Reason is incorrect because the glittering of a diamond is not related to the absorption of sunlight,but rather to the phenomenon of Total Internal Reflection $(TIR)$.

Class 12 Physics Ray Optics and Optical Instruments Critical Angle and Total Internal Reflection

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Assertion: Diamond glitters brilliantly.
Reason: Diamond does not absorb sunlight.

AIIMS 2005 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

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Ray Optics and Optical Instruments

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Critical Angle and Total Internal Reflection

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Assertion: Diamond glitters brilliantly.Reason: Diamond does not absorb sunlight.

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The reason for the shining of an air bubble in water is

An optical fibre consists of a core of refractive index $\mu_1$ surrounded by a cladding of refractive index $\mu_2 < \mu_1$. $A$ beam of light enters from air at an angle $\alpha$ with the axis of the fibre. The highest angle $\alpha$ for which the ray can travel through the fibre is:

The critical angle of light going from medium $x$ to medium $y$ is $\theta$. The speed of light in medium $x$ is $v$. The speed of light in medium $y$ is:

It is found that electromagnetic signals sent inside a glass sphere from $A$ towards $B$ reach point $C$. The speed of electromagnetic signals in glass cannot be:

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Assertion: Diamond glitters brilliantly.
Reason: Diamond does not absorb sunlight.