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Match List-I with List-II regarding the changes made to a standard Young's double slit experiment setup and their effects on the angular fringe width. List-I (Change in setup) List-II (Effect on angular fringe width) A. Screen moved away from slits I. Increases B. Slit separation is halved II. Decreases C. Setup is immersed in a liquid of refractive index 1.5 III. Remains constant D. Incident light changed from blue

Options

  1. AA-I, B-II, C-II, D-I
  2. BA-III, B-IV, C-II, D-I
  3. CA-III, B-II, C-I, D-II
  4. DA-I, B-IV, C-I, D-II

Correct answer

B. A-III, B-IV, C-II, D-I

Step-by-step solution

The angular fringe width in a Young's double slit experiment is given by = d , where is the wavelength and d is the slit separation. It is independent of the screen distance D . A. Screen moved away from slits: Since does not depend on D , the angular fringe width remains constant. (A III) B. Slit separation is halved: New slit separation d' = d 2 . The new angular width ' = (d/2) = 2 ( d ) = 2 . It becomes double. (B IV) C. Setup is immersed in a liquid: The wavelength decreases to ' = 1.5 . Since , the angular fr

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