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In double slit experiment what should be...

In double slit experiment what should be the width of each slit to obtain 10 maxima of the double slit pattern within the central maxima of single slit pattern with d=2 mm.

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`(10lambda)/d=(2lambda)/a`
`10/d=lambda/a`
`10/(2xx10^(-3))=2/a`
`a=4xx10^(-4)` m
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