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Question 20211
JEE Physics · Medium

Electromagnetic Waves and Wave Optics: Interference — Energy Conservation MCQ

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Interference — Energy ConservationMediumQuestion 20211

Question

In an interference pattern, energy at dark fringes goes to:
  1. A
    Disappears as heat
  2. B
    Bright fringes — energy is redistributed, not destroyed
    Correct
  3. C
    Sound
  4. D
    The source

Correct answer

Bright fringes — energy is redistributed, not destroyed

Explanation

Interference does not create or destroy energy — it redistributes it. The energy 'missing' from dark fringes appears as extra energy at the bright fringes. Average intensity = sum of individual intensities, conserving energy.

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