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COMEDK20269 May 2026Evening ShiftPhysicsWave OpticsActual

If the intensity of the central maximum in the Young's double slit experiment is I₀ , what will be the intensity at the same region when one of the slits is blocked by an opaque object?

Options

  1. AI₀ 2
  2. BI₀
  3. CI₀ 4
  4. DI₀ 8

Correct answer

C. I₀ 4

Step-by-step solution

Let the intensity of light from each slit be I . The intensity of the central maximum in Young's double slit experiment is given by I_ max = ( I + I )^2 = 4I . Given that I_ max = I₀ , we have I₀ = 4I I = I₀ 4 . When one of the slits is blocked, there is no interference. The intensity at any point on the screen is solely due to the light from the single unblocked slit. Thus, the intensity at the same region will be I = I₀ 4 . Answer: I₀ 4

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