If the critical angle for the material of a prism is C and the angle of the prism is A, then there will be no emergent ray when
A. A < 2 C
B. A = 2 C
C. A > 2 C
D. A < \(\frac {C}{2}\)
Answer:C
If the critical angle for the material of a prism is C and the angle of the prism is A, then there will be no emergent ray when
A. A < 2 C B. A = 2 C C. A > 2 C D. A < \(\frac {C}{2}\)