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Question

In Young's double-slit experiment, ligth of wavelength 5000 ˚A is used. The thire bright band on the screen is formed at a distance of 1 cm from the central bright band.if the screen is at a distance of 1.5 m from the centre of the two narrow slits, calculate the separation between the slits.

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Solution

λ=5000An=3D=1.5mwkt,β=nλDdd=nλDβ=3×5000×1010×1.5102=225×106md=0.0225cm

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