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MHT CET202613 April 2026Morning ShiftPhysicsWave OpticsActual

In Young's double slit experiment, the angular width of a fringe is found to be 0.2^ on a screen placed 1m away. The wavelength of light used in 600 nm. If the entire apparatus is immersed in water of refractive index 4/3. the angular width of the fringe will be

Options

  1. A0.10^
  2. B0.15^
  3. C0.20^
  4. D0.25^

Correct answer

B. 0.15^

Step-by-step solution

The angular width of a fringe in Young's double slit experiment is given by = d When the apparatus is immersed in a liquid of refractive index , the wavelength of light changes to ' = The new angular width becomes ' = ' d = d = Given = 0.2^ and = 4 3 ' = 0.2^ 4/3 = 0.2^ 3 4 = 0.15^ Answer: 0.15^

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