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Q. In young's experiment let lights of Lemda = 5.48 × 10^-7m and 6.85 × 10^-8 m we use to interns keeping D and d constant .compare the fingers with in two cases .
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fringe width, bita = D×lemda/ d
bita1/bita2 = lemda1/ lemda2
= 5.48×10^-7/6.85×10-8
= 8: 1.
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