The intensity ratio of the maxima and minima in an interference pattern produced by two coherent sources of light is `9:1.` The intensities of the used light sources are in ratio

Options

A. `3:1`
B. `4:1`
C. `9:1`
D. `10:1`

Answer

B

Explanation

`(I_("max"))/(I_("min"))=((a+b)^(2))/((a-b)^(2))implies(9)/(1)=((a+b)^(2))/((a-b)^(2))`
or `(3)/(1)=(a+b)/(a-b)` or `3a-3b=a+b` or `a=2b`
`:.(I_(1))/(I_(2))=(a^(2))/(b^(2))=(4)/(1)`