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MHT CET202415 May 2024Evening ShiftPhysicsWave OpticsActual

A plate of refractive index 1.6 is introduced in the path of light from one of the slits in Young's double slit experiment then

Options

  1. Athe fringe width towards the side of the plate will decrease.
  2. Bthe central maximum will shift towards this side
  3. Cnumber of fringes seen will decrease.
  4. Dinterference pattern will disappear.

Correct answer

B. the central maximum will shift towards this side

Step-by-step solution

When a thin plate of refractive index (n ) is introduced in front of one of the slits in Young's double-slit experiment, it adds an extra optical path (and hence a phase difference) to the light coming from that slit. This shifts the entire interference pattern on the screen but does not change the fringe spacing or make the pattern disappear. Fringe width does not change because it depends on the slit separation and the wavelength in air, not on a uniform phase shift introduced in one path. Number of visible fring

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