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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 0.2∘0.2^\circ. What will be the angular width of the first minimum if the entire experimental apparatus is immersed in water (μw=4/3\mu_w = 4/3)?

  1. A.0.266∘0.266^\circ
  2. B.0.15∘0.15^\circ✓
  3. C.0.05∘0.05^\circ
  4. D.0.1∘0.1^\circ

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