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Two slits are separated by a distance of 0 .5 mm and illuminated with light of wavelength λ = 6000 A ∘ . If the screen is placed at 2 .5 m from the slits. The distance of the third bright fringe from the centre will be

Options

  1. A1.5 m m
  2. B3 m m
  3. C6 m m
  4. D9 m m

Correct answer

D. 9 m m

Step-by-step solution

The distance of n th bright fringe from the centre, x n = n D λ d So, x 3 = 3   ×   2.5   ×   6000   ×   10 - 10 0.5   ×   10 - 3 = 9 × 10 - 3   m = 9   mm

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