A) 60 W
B) 78 W
C) 94 W
D) 136 W
Correct Answer: C
Solution :
In photometry luminous flux or luminous power is the measure of the perceived power of light. One lumen is defined as the luminous flux of light produced by a light source that emits one candela of luminous intensity over a solid angle of one steradian. \[F=4\pi I=4\times 3.14\times 30=377\,\text{lumen}\] \[\text{Power}\,\text{of}\,\text{lamp}\,\text{=}\,\,\frac{\text{luminous}\,\text{flux}}{\text{luminous}\,\text{efficiency}}\] \[=\frac{377}{4}\approx 94\,W\]
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