Question

The critical angle of diamond is​

Answer 1

Answer: 24.5 degrees

Inside the diamond there is a very specific path for the light to follow and escape forever. This escape route is the critical angle, which is 24.5 degrees. This is actually more accurately described as an imaginary cone where the point starts at the surface entry or exit point and flares outward at 24.5 degrees.

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Answer 2

The critical angle of diamond is more than 24 degree and less than 90 degree. And its refractive index is 2.42.