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PhysicsNEET 2019Interference and Young's double slit

Wave Optics

In a double-slit experiment, when light of wavelength 400 nm was used, the angular width of the first minimum formed on a screen placed 1 m away was found to be . What will be the angular width of the first minimum if the entire experimental apparatus is immersed in water ()?

  1. A.
  2. B.
  3. C.
  4. D.

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