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} $
Show Answer
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
