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))`
` :. (9)/(1)=((A+B)^(2))/((A-B)^(2)) " or "(3)/(1)=(A+B)/(A-B)`
` "or " 2A=4Bimplies(A)/(B)=2`
` :. (I_(1))/(I_(2))=(A^(2))/(B^(2))=(4)/(1)`