question_answer

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?

A) Equal to 2C      

B) Less than 1C

C) More than 2C

D) None of the above

Correct Answer: C

Solution :

[c] From ray diagram \[A-C+\theta \]For TIR at AC \[\theta >C\]So A>2C