Question

what do you mean by critical angle of a prism​

Answer 1

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The Critical Angle Derivation

So the critical angle is defined as the angle of incidence that provides an angle of refraction of 90-degrees. ... For the water-air boundary, the critical angle is 48.6-degrees. For the crown glass-water boundary, the critical angle is 61.0-degrees.

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Answer 2

Answer:

The critical angle is defined as the angle of incidence that provides an angle of refraction of 90-degrees.