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Wave Optics — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
MCQ
Two sources are called coherent if they produce waves:
  • A
    Of equal wavelength.
  • B
    Of equal velocity.
  • C
    Having same shape of wavefront.
  • ✓
    Having a constant phase difference.
✓

Answer

Correct option: D.
Having a constant phase difference.

For light waves emitted by two sources of light to remain coherent, the initial phase difference between waves should remain constant in time. If the phase difference changes continuously or randomly with time, then the sources are incoherent.

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