# Two laser beams one of wave length 640 nm and the other 400 nm have same unit flux of photons. Their powers are in the ratio

Mayajyothi C J
126 Points
5 years ago
$P \alpha \frac{1}{\lambda ^{2}}$

$\frac{P_{1}}{P_{2}} =\frac{(\lambda _{2})^{2}}{(\lambda_{1})^{2}}$
$=\frac{400^{2}}{650^{2}}$
$=\frac{64}{169}$