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NEET2020PhysicsWave OpticsActual

In Young’s double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes:

Options

  1. Ahalf
  2. Bfour times
  3. Cone-fourth
  4. Ddouble

Correct answer

B. four times

Step-by-step solution

β = λ D d β ' = λ D ' d ' D ' = 2 D , d ' = d 2 β ' = λ × 2 D d 2 = 4 λ D d β ' = 4 β Fringe width becomes 4 times.

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