In Young's experiment the ratio between the intensities of bright and dark fringes is `9:1` this means

Options

A. the intensities at the screen due to the slits are 5 units each
B. the intensities at the screen due to the slits are 4 units and 2 units
C. the amplitude are in the ratio `1:3`
D. the amplitude ratio is `2:1`

Answer

D

Explanation

`(I_("max"))/(I_("min"))=((a_(1)+a_(2))^(2))/((a_(1)-a_(2))^(2))=(9)/(1)`