[CPMT 2001]
A) $ \frac{1}{4\pi } $
B) $ 8\pi $
C) $ 4\pi $
D) $ \frac{1}{8\pi } $
Correct Answer: C
Luminous intensity $ L=\frac{\varphi }{4\pi } $
$ \Rightarrow 1=\frac{\varphi }{4\pi }\Rightarrow \varphi =4\pi $ .
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