Question

What are cohrent sources why are cohrent sources.Req?

Answer 1

Answer:

Coherent sources have same wavelength, frequency, and a constant phase difference between two light sources. For interference coherent sources are required because then only we will have constant maximum and minimum intensity of light on screen, other there will be a continuous fluctuation of intensity on screen.

Explanation:

This is because light beams are emitted by millions of atoms radiating independently so the phase difference betwwwn waves between non coherent sources fluctuates randomly at a very high frequency