Why in the below question we are not using the formula which

Last updated: 6/25/2023

Why in the below question we are not using the formula which is given below after finding the phase difference The below given formula is used for finding the resultant i ntensity Please say what are the difference between these two for mula 1 the intensity at the maximum in a young double slit experiment is lo distance between two slits is d 5A where A is the wavelength of light used in front of one of the slit on the screen placed at a distance D 10d 20 03 2017 4074 A4988 5 D Path difference Ax sp sp 5x D D 52 10d 10d Vi 52 501 507 50 25 50 25 2 4 Hence phase diff A Now 1 1 cos cos