Question

How to find intensity by yongs double slit ex periment?

Answer 1

The steps are:

I = Io cos^2 (ø/2)

1. ø = 2pi/lambda * lambda/4 = pi/2

I = Io cos^2 ((pi/2)/2) = Io cos^2 (pi/4) = Io (1/sqrt(2))^2 = Io/2

2. ø = 2pi/lambda * lambda/3 = 2pi/3

I = Io cos^2 ((2pi/3)/2) = Io cos^2 (pi/3) = Io (1/2)^2 = Io/4

I hope it will help you