A) 62 W
B) 76 W
C) 138 W
D) 264 W
Correct Answer: D
Solution :
Luminous flux\[=4\pi \ L\]\[=4\times 3.14\times 42\ =\ 528\]Lumen Power of lamp \[=\frac{\text{Luminous}\ \text{flux}}{\text{Luminous}\,\text{efficiency}}\]\[=\frac{528}{2}=264\ W\]
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