Describe Young.s double slit experiment to determine bandwidth of the interference pattern.

A Young.s double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen

In Young.s double slit experiment is used to demonstrate interference of light.In Young.s double slit experiments, 1 mm slit separation produces a bandwidth of 0.6 mm on a screen placed at a certain distance away from the slits.When the screen is moved further away from the slits through 0.25 m, the bandwidth becomes 0.75 mm. Find the initial separation between slits and screen.