Question
Physics Question on wave interference
The necessary condition for an interference by two sources of light is that
A
two light sources must have the same wave length
B
two point sources should have the same amplitude and same wavelength
C
two sources should have the same wave, length, nearly the same amplitude and have a constant phase difference
D
two point sources should have a randomly varying phase difference
Answer
two sources should have the same wave, length, nearly the same amplitude and have a constant phase difference
Explanation
Solution
Two sources should have the same wavelength, nearly the same amplitude and have a constant phase difference. If the phase difference between two interfering waves does not remain constant, interference pattern will not be Sustained.