Q.

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.
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