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JEE Main20202 Sep 2020Evening ShiftPhysicsWave OpticsActual

In a Young's double slit experiment, 16 fringes are observed in a certain segment of the screen when light of wavelength 700 nm is used. If the wavelength of light is changed to 400 nm , the number of fringes observed in the same segment of the screen would be :

Options

  1. A24
  2. B30
  3. C18
  4. D28

Correct answer

D. 28

Step-by-step solution

y = m 1 D λ 1 d = m D λ 2 d m 2 m 1 = λ 1 λ 2 ⇒ m 2 = 700 400 × 16 = 28

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