A) 50%
B) 25%
C) 20%
D) 17%
Correct Answer: D
Solution :
[d] The solid angle subtended by area shown by the shaded portion in |
\[2\pi \,(1-\cos \,C)\] |
So, % going out \[=\frac{2\pi (1-\cos C)}{4\pi }\times 100\] |
\[=\frac{1}{2}\,(1-\cos C)\times 100=17%\] |
C = critical angle. |
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