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Question

In the Young's double slit experiment ,two slits 0.125mm apart are illuminated by light of wavelength 4500Ao. The screen is 1m away from the plane of the slits. Find the separation between second bright fringes on both sides of central maxima.

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Solution

Given : D=1 m λ=4500×1010 m d=0.125×103 m
Position of second bright fringe y=2λDd
y=2×4500×1010×10.125×103=7.2×103 m=7.2 mm
Separation between second bright fringe fringes on both sides l=2y=2×7.2=14.4 mm

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