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In Young's double slit experiment, the screen is kept 1.6 m from the slits. The coherent sources are 0.032 c m apart and fringes are observed on the screen. It is found that with a certain monochromatic source of light, the fourth bright fringe is situated at a distance of 1.06 c m from the central fringe. The wavelength of the light used is

Options

  1. A530 n m
  2. B265 n m
  3. C1060 n m
  4. D132.5 n m

Correct answer

A. 530 n m

Step-by-step solution

For maxima Δ x = n λ d y D = n λ For n = 4 λ = d y 4 D = 0.032 × 1 0 - 2 × 1.06 × 1 0 - 2 4 × 1.6 = 530 n m

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