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Q.

A light ray is incident by grazing one of the face of a prism and after refraction ray does not emerge out, what should be the angle of prism while critical angle is C?

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a

Equal to 2C

b

Less than 2C

c

None of the above

d

More than 2C

answer is C.

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Detailed Solution

From ray diagram
A = C + 0 for TIR at AC
0 > C so A > 2 C

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