In a biprism experiment, the slit separation is 1 ~mm . Using monochromatic light of wavelength 5000 Å , an interference pattern is obtained on the screen. Where should the screen be moved, so that the change in fringe width is 12 5 10⁻⁵ ~m

Question

In a biprism experiment, the slit separation is 1 ~mm . Using monochromatic light of wavelength 5000 Å , an interference pattern is obtained on the screen. Where should the screen be moved, so that the change in fringe width is 12 5 10⁻⁵ ~m ?

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Correct answer: A. Away or towards the slit by 25 am

d =1 10⁻³ ~m =5000 Å=5 10⁻⁷ ~m ₂- ₁=12.5 10⁻⁵ ~m D ₂- D ₁=? ₁= D ₁ ~d ₂= D ₂ ~d ₂- ₁= d ( D ₂- D ₁ ) ( D ₂- D ₁ )= d ( ₂- ₁ ) ( D ₂- D ₁ )= 10⁻³ 5 10⁻⁷ 12.5 10⁻⁵= 12.5 50 =25 ~cm

In a biprism experiment, the slit separation is 1 ~mm . Using monochromatic light of wavelength 5000 Å , an interference pattern is obtained on the screen. Where should the screen be moved, so that the change in fringe width is 12 5 10⁻⁵ ~m ?

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