Question

describe Young double slit interference experience and derive conditions for
occurrence of dark and bright fringes
on the screen. Define fringe width and
derive a formula for it.​

Answer 1

Answer:

Use X as the wavelength of the monochromatic source, D as the distance of the screen from the slits and d as the distance of separation between the slits. ... So fringe width Y is defined as the distance between two consecutive dark fringe or distance between two consecutive bright fringe.