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JEE Main20199 Jan 2019Evening ShiftPhysicsWave OpticsActual

In a young's double slit experiment, the slits are placed 0.320 m m apart. Light of wavelength λ = 500 n m is incident on the slits. The total number of bright fringes that are observed in the angular range - 30 o ≤ θ ≤ 30 o is:

Options

  1. A321
  2. B641
  3. C320
  4. D640

Correct answer

B. 641

Step-by-step solution

d s i n θ = n λ n = 0.320 × 10 - 3 × 1 2 500 × 10 - 9 = 320 Hence number of maxima = 320 × 2 + 1 = 641

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