Optics Question 505

Question: When sunlight falls normally on earth, a luminous flux of $ 1.57\times 10^{5}\ lumen/m^{2} $ is produced on earth. The distance of earth from sun is $ 1.5\times 10^{8}Km $ . The luminous intensity of sun in candela will be

Options:

A) $ 3.53\times 10^{27} $

B) $ 3.53\times 10^{25} $

C) $ 3.53\times 10^{29} $

D) $ 3.53\times 10^{21} $

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Answer:

Correct Answer: A

Solution:

$ I=\frac{L}{r^{2}} $

$ \Rightarrow L=1.57\times 10^{5}\times {{(1.5\times 10^{11})}^{2}} $

$ =3.53\times 10^{27} $ Cd



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