JEE Main & Advanced
Physics
Question Bank
Prism Theory and Dispersion of Light
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 \[A>2C\]