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 2C

C)            More than 2C                      

D)            None of the above

Correct Answer: C

Solution :

                   From ray diagram \[A=C+\theta \] for TIR at AC \[\theta >C\]so \[A>2C\]