Question

what are the basic condition for obtaining standard and well defined interference fringe on the screen​

Answer 1

a) Necessary conditions for sustained interference fringes are: i) Two sources must be coherent. They should emit continuous light waves of same wavelength or frequency. ii) Two sources of light must be narrow.

Answer 2

a) Necessary conditions for sustained interference fringes are: i) Two sources must be coherent. They should emit continuous light waves of same wavelength or frequency. ii) Two sources of light must be narrow.