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JEE Main20199 Apr 2019Morning ShiftPhysicsWave OpticsActual

The figure shows a Young's double slit experimental setup. It is observed that when a thin transparent sheet of thickness t and refractive index μ is put in front of one of the slits, the central maximum gets shifted by a distance equal to n fringe width. If the wavelength of light used is λ then t will be:

Options

  1. AD λ a ( μ - 1 )
  2. Bn λ ( μ - 1 )
  3. C2 n λ ( μ - 1 )
  4. D2 D λ a ( μ - 1 )

Correct answer

B. n λ ( μ - 1 )

Step-by-step solution

Shift in central maxima = D a μ - 1 t Fringe width = D λ a It's given, D a μ - 1 t = n D λ a t = n λ μ - 1

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