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KCET2007PhysicsWave Optics

Light from two coherent sources of the same amplitude A and wavelength illuminates the screen. The intensity of the central maximum is I₀ . If the sources were incoherent, the intensity at the same point will be

Options

  1. A4 I₀
  2. B2 I₀
  3. CI₀
  4. DI₀ 2

Correct answer

D. I₀ 2

Step-by-step solution

The rays of light from two coherent sources superimpose each other on the screen forming alternate maxima (with maximum intensity I₀ ) and minima (with intensity zero). If two non-coherent sources superimpose, there will be no maxima and minima, instead the intensity will be I₀ 2 throughout.

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