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Question 20210
JEE Physics · Medium

Electromagnetic Waves and Wave Optics: Coherent Sources — Method MCQ

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Coherent Sources — MethodMediumQuestion 20210

Question

In practice, coherent light sources are obtained by:
  1. A
    Using two separate laser sources
  2. B
    Splitting a single source into two using mirrors or slits
    Correct
  3. C
    Using two LEDs of same colour
  4. D
    Filtering with a monochromator

Correct answer

Splitting a single source into two using mirrors or slits

Explanation

Two independent sources (even two identical lasers) are not coherent due to random phase jumps. Coherent beams must be derived from the same wavefront — as in YDSE (same slit source), Lloyd's mirror, or interferometers (Michelson, Fabry-Perot).

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