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MHT CET202525 Apr 2025Morning ShiftPhysicsWave OpticsActual

If the two sources of light emit waves of different amplitudes and interfere then

Options

  1. Athere is some intensity of light in the region of destructive interference.
  2. Bfringe width is less.
  3. Cbrightness of fringes is less.
  4. Dfringes disappear after short time.

Correct answer

A. there is some intensity of light in the region of destructive interference.

Step-by-step solution

The resultant intensity in interference depends on the phase relationship between waves of amplitudes A₁ and A₂ . With A₁ A₂ , the minimum intensity I_ (A₁ - A₂)^2 is non-zero since |A₁ - A₂| > 0 . This ensures some light persists even in destructive interference regions. Fringe width = D/d remains unchanged as it is amplitude-independent. While contrast diminishes, fringes do not disappear over time due to amplitude differences alone. Only option A correctly describes the consequence of unequal amplitudes: A .

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