Dual Nature Of Light Question 347
Question: A light of wavelength $ \lambda $ and intensity l is incident normally on the surface. If reflection coefficient of surface is r, the pressure exerted by light on the surface is equal to
Options:
A) $ \frac{2I}{c} $
B) $ \frac{I}{c}r $
C) $ \frac{I}{c}( I+r ) $
D) $ \frac{I}{c}( I-r ) $
Show Answer
Answer:
Correct Answer: C
Solution:
[c] $ F=\frac{dP}{dt}=( \frac{IA}{hc/\lambda } )( 1+r )\frac{h}{\lambda } $
$ \Rightarrow P=\frac{F}{A}=\frac{I}{c}( 1+r ) $
BETA
