First slide

Prism

Question

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

Moderate

A

Equal to 2C
B

Less than 2C
C

More than 2C
D

None of the above

Solution

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

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