Question

Which one has higher critical angle diamond or water

Answer 1

HERE IS YOUR ANSWER MATE:-

Light traveling from diamond to water strikes the interface with the angle of incidence of 86° as shown in the picture. The angle of incidence is greater than the critical angle and so the light will be trapped within the diamond.

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Answer 2

33.33 degrees

Critical angle for light passing from diamond into water = arcsin (1/1.82) = 33.33 degrees.