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A monochromatic beam of light falls on Young's double slit experiment apparatus as shown in figure. A thin sheet of glass is inserted in front of lower slit S 2 ( λ = 600 n m is wavelength of source) If the central bright fringe is obtained on screen at 'O' then

Options

  1. Aμ - 1 t = d sin ⁡ θ
  2. Bμ - 1 t = d cos ⁡ θ
  3. Cμ t = d θ
  4. DNot possible

Correct answer

A. μ - 1 t = d sin ⁡ θ

Step-by-step solution

Total path difference ∆ x = μ - 1 t - d sin ⁡ θ . For central maxima ∆ x = 0 hence μ - 1 t = d sin ⁡ θ

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