What is meant by the statement 'the critical angle for diamond is $24^{\circ}$ ?

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Solution

Critical angle for diamond is 24 degrees, means that, when light travels from the diamond to air, the angle of incident is 24 degrees for which the angle of refraction will be 90 degrees. As a result, if the incidence angle is greater than 24 degrees it undergoes total internal reflection and hence diamond shines.

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