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NEET2014PhysicsWave OpticsActual

A beam of light of λ = 600   n m from a distant source falls on a single slit 1   m m wide and the resulting diffraction pattern is observed on a screen 2   m away. The distance between first dark fringes on either side of the central bright fringe is:

Options

  1. A1.2 c m
  2. B1.2 m m
  3. C2.4 c m
  4. D2.4 m m

Correct answer

D. 2.4 m m

Step-by-step solution

Angular width of 1 s t maxima 2 θ = 2 λ a Linear width of 1 s t maxima = D 2 θ = 2 λ D a = 2 × 600 × 10 - 9 2 1 × 10 - 3 = 2.4 m m

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