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GK QUESTION#3055

Interference of light waves is primarily caused by:

  1. ALight consisting of particles (photons)
  2. BLight bending around edges (diffraction)
  3. CThe principle of superposition of wavesCorrect answer
  4. DThe alignment of light waves in a particular direction (polarization)
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Answer

C. The principle of superposition of waves

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Explanation

Interference follows from superposition: overlapping wave disturbances add. Coherent waves can give stable constructive and destructive interference, producing bright and dark fringes. Diffraction also involves wave superposition, but bending at an edge is not the definition asked for here.

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