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NEETPhysicsWave Optics

STATEMENT-1 : The two slits in YDSE are illuminated by two different sodium lamps emitting light of same wavelength. No interference pattern will be observed. STATEMENT - 2 : Two independent light sources (except LASER) cannot be coherent.

Options

  1. AStatement - 1 is True, Statement - 2 is True; Statement - 2 is a correct explanation for Statement - 1.
  2. BStatement - 1 is True, Statement - 2 is True; Statement - 2 is NOT a correct explanation for Statement - 1.
  3. CStatement - 1 is True, Statement - 2 is False.
  4. DStatement - 1 is False, Statement - 2 is True.

Correct answer

A. Statement - 1 is True, Statement - 2 is True; Statement - 2 is a correct explanation for Statement - 1.

Step-by-step solution

"The two slits in YDSE are illuminated by two different sodium lamps emitting light of same wavelength. No interference pattern will be observed." Correct. Even though wavelength is same, two independent lamps are not coherent sources (their phase difference keeps changing randomly), so no sustained interference pattern is formed. Statement-2: "Two independent light sources (except LASER) cannot be coherent." ( ) Correct. Coherent sources must maintain a constant phase difference, which is not possible with indepen

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