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) \[A>2C\]
B) \[A<2C\]
C) \[A=2C\]
D) None of these
Correct Answer:
A
Solution :
From figure, \[A=C+\theta \] For total internal reflection at AC \[\theta >C\] So, \[A>2C\]