Dual Nature Of Light Question 347
A light of wavelength $ \lambda $ and intensity I 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:
$ F=\frac{dP}{dt}=\left( \frac{IA\lambda}{hc} \right)( 1+r )\frac{h}{\lambda } $ $ \Rightarrow P=\frac{F}{A}=\frac{I}{c}( 1+r ) $
BETA
