Optics Question 989
Question: A normally incident ray reflected at an angle of $ 90^{o} $ . The value of critical angle is
[RPMT 1996]
Options:
A) $ 45^{o} $
B) $ 90^{o} $
C) $ 65^{o} $
D) $ {{43.2}^{o}} $
Show Answer
Answer:
Correct Answer: B
Solution:
Critical angle C is equal to incident angle if ray reflected normally
$ \therefore C=90^{o} $
