Question

Two light beams of intensities in the ratio of 9 : 4 are allowed to interfere. The ratio of the intensity of maxima and minima ______.

Options

• 2 : 3

• 16 : 81

• 25 : 169

• 25 : 1

Answer 1

Two light beams of intensities in the ratio of 9 : 4 are allowed to interfere. The ratio of the intensity of maxima and minima 25 : 1.

Explanation:

`"I"_"max"/"I"_"min" = ((sqrt"I"_1+sqrt"I"_2)^2)/((sqrt"I"_1-sqrt"I"_2)^2)`  

= `((sqrt9+sqrt4)^2)/((sqrt9-sqrt4)^2)`  

= `25/1`