Question

The intensity variation in the interference pattern obtained with the helping two coherent source is 5%of the average intensity. Find out the ratio of intensities of two sources.
answer is 1680:1 . please someone tell the process

Answer 1

Answer:

1680:1

Explanation:

Imax./Imin. = 105/95= 21/19

(a1+ a2)2/(a1-a2)2= 21/19

a1+a2/a1-a2=√21/19 = 1.05

a1+a2 = 1.05a1 - 1.05 a2

0.05a1 = 2.05 a2

a1/a2 = 2.05/0.05 = 41/1

I1/I2 = (A1)2/(A2)2 = 1680/1