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Q. In Young's double slit experiment the distance between the slits is 1.9 mm. The distance between the slit and the screen is 1 m. If the bandwidth is 0.35 mm Compute the wavelength of the light used

Bandwidth β = D λ/ d

λ = β d / D

= 35 X 10 ^-5 X 1.9 X 10 ^-3 / 1

= 66.5 X 10^-8m = 6650 A⁰.

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