Two sources are called coherent if they ...

Two sources are called coherent if they produce waves

A

of equal wavelength

B

of equal velocity

C

having same shape of wavefront

D

having a constant phase difference.

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The correct Answer is:

D

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HC VERMA-LIGHT WAVES-Objective 1

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The wavefronts of light coming from a distant source of unknown shape...
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The inverse square law of intensity (i.e., the intensity prop1/r^2) is...
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Two sources are called coherent if they produce waves
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