Optics Question 803
Question: A glass prism of refractive index 1.5 is immersed in water (refractive index 4/3). A light beam incident normally on the face AB is totally reflected to reach on the face BC if
Options:
A) $ \sin \theta \ge \frac{8}{9} $
B) $ \frac{2}{3}<\sin \theta <\frac{8}{9} $
C) $ \sin \theta \le \frac{2}{3} $
D) $ \frac{1}{2}<\sin \theta <1 $
Show Answer
Answer:
Correct Answer: A
Solution:
[a] The phenomenon of total internal reflection takes place during reflection at P.
