Question

explain the critical angle for glass prism​

Answer 1

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When the angle of incidence in water reaches a certain critical value, the refracted ray lies along the boundary, having an angle of refraction of 90-degrees. This angle of incidence is known as the critical angle

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Answer 2

Answer:

Critical angle of a glass prism is the angle of incidence in the glass, that is, the denser medium for which the angle of refraction in the rarer medium, say air, is 90°.

The critical angle of glass prism is about 42°.