In the Young's double slit experiment, the intensity of light at a point on the screen where the path difference . is K, (. being the wavelength of light used). The intensity at a point where the path difference is /4 will be
Intensity at any point on the screen is
where is the intensity of either wave and is the phase different between two waves.
Phase difference, path difference
When path difference is , then
. . . . .(i)