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JEE Main20202 Sep 2020Morning ShiftPhysicsWave OpticsActual

Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source λ = 632 . 8 nm . The distance between the screen and the slits is 100 cm . If a bright fringe is observed on a screen at distance of 1 . 27 mm from the central bright fringe, then the path difference between the waves, which are reaching this point from the slits is close to :

Options

  1. A1 . 27 μ m
  2. B2   . 87 nm
  3. C2   nm
  4. D2 . 05   μm

Correct answer

A. 1 . 27 μ m

Step-by-step solution

Δ P = d sin θ = d θ = d y D = 10 - 3 × 1 . 270   mm 1   m = 1 . 27 μ m 1 . 27 μ m

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