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MPSC State Service 2018 · GS · Question 39 of 99

Two parallel slits 1 millimetre apart are placed 1 metre away from the screen. What is the fringe separation due to interference effect, when a beam of wavelength 500 nanometres is incident on them?

Physics

  1. A5.0 mm
  2. B0.5 mmCorrect
  3. C5.0 cm
  4. D0.05 mm

Answer: B. 0.5 mm

Explanation

Fringe width β = λD/d = (500×10⁻⁹ × 1) / 10⁻³ = 0.5 mm.

Source: MPSC Rajyaseva Prelims 2018 GS Paper I (official paper)

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