A transparent solid cylindrical rod has a refractive index of 
. It is surrounded by air. A light ray is incident at the midpoint of one end of the rod as shown in the figure.
The incident angle θ for which the light ray grazes along the wall of the rod is -
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
μ air sin θ = μ cylider . sin (90 – θ C )
⇒ 1.sin θ = 
.cos θ C
⇒ sin θ = 
cos 
= 
= 
= 
⇒ θ = sin –1 
.
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