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JEE Main202124 Feb 2021Evening ShiftPhysicsWave OpticsActual

If the source of light used in a Young's double slit experiment is changed from red to violet:

Options

  1. Aconsecutive fringe lines will come closer.
  2. Bthe fringes will become brighter.
  3. Cthe central bright fringe will become a dark fringe.
  4. Dthe intensity of minima will increase.

Correct answer

A. consecutive fringe lines will come closer.

Step-by-step solution

β = λ · D d λ R > λ V β R = λ R D d and β V = λ V D d β R > β V Fringe pattern will shrink.

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