Two light sources are said to be coherent if they are obtained from
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a
Two independent point sources emitting light of the same wavelength
b
A single point source
c
A wide source
d
Two ordinary bulbs emitting light of different wavelengths
answer is B.
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Detailed Solution
When two sources are obtained from a single source, the wavefront is divided into two parts. These two wavefronts acts as if they emanated from two sources having a fixed phase relationship.