Question

In Young's double slit experiment, what is meant by 'fringe width' or 'fringe separation'? State two ways of increasing the fringe width, without changing the source of light.

Answer 1

Fringe Width: The distance between two consecutive bright or dark fringes is called fringe width.

Two ways of increasing the fringe width without changing the source are: 

(1) By increasing the distance between slits and the screen,

(2) By decreasing the distance between the slits.