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Two slits are separated by a distance of 0.5 mmand illuminated withlight of wavelength =6000 Å . If the screen is placed at 2.5 ~m from the slits. The distance of the third bright fringe from the centre will be

Options

  1. A1.5 ~mm
  2. B3 ~mm
  3. C6 ~mm
  4. D9 ~mm

Correct answer

D. 9 ~mm

Step-by-step solution

Distance of n^ th bright fringe from the centre, x_n= n D d So, aligned x₃ & = 3 2.5 6000 10⁻¹⁰ 0.5 10⁻³ & =9 10⁻³ ~m =9 ~mm aligned

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