For an equilateral prism having refractive index 3, what is the angle of incidence of a ray of light, so that the ray is parallel to the base inside the prism?

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30o

45o

60o

90o

answer is C.

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Detailed Solution

Angle of refraction r=90o-60o=30o∴sini=μsinr=3sin30o=32 ⇒i=60o

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