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In Young’s double slit experiment how many maximas can be obtained on a screen (including the central maximum) on both sides of the central fringe ( $λ = 2000 Å$ and $d = 7000 Å)$

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answer is B.

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Detailed Solution

$d \sin θ = n λ$

$\frac{7000}{2000} = 3.5 so third maxima on either side and central maxima$

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