Two coherent sources of light can be obtained by
[MH CET 2001]
Two different lamps
Two different lamps but of the same power
Two different lamps of same power and having the same colour
None of the above
The coherent source cannot be obtained from two different light sources.
Two sources of light are said to be coherent when both give out light waves of same:
In a Fresnel's biprism experiment, the two coherent sources are obtained by: