A) 1.5
B) 0.5
C) 1.3
D) None of these
Correct Answer: B
Solution :
Consider the figure if smallest angle of incidence q is greater than critical angle then all light will emerge out of B Þ \[\theta \ge {{\sin }^{-1}}\left( \frac{1}{\mu } \right)\Rightarrow \sin \theta \ge \frac{1}{\mu }\] from figure \[\sin \theta =\frac{R}{R+d}\] Þ \[\frac{R}{R+d}\ge \frac{1}{\mu }\Rightarrow \left( 1+\frac{d}{R} \right)\le \mu \] Þ \[\frac{d}{R}\le \mu -1\Rightarrow {{\left( \frac{d}{R} \right)}_{\max }}=0.5\]You need to login to perform this action.
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