The intensity variation in the interference pattern obtained with the help of two coherent source is `5%` of the average intensity find out the ratio of intensties of two sources.

Explanation

`I_(max)/I_(min)=105/95=21/19`
`implies(a_1+a_2)/(a_1-a_2)=sqrt(21/19)=1.05`
`impliesa_1+a_2=1.05a_1-1.05a_2`
`0.05a_1=2.05a_2`
`impliesa_1/a_2=2.05/0.05=41/1`
`thereforeI_1/I_2=a_1^2/a_2^2=1680/1`