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In deriving the single slit diffraction ...

In deriving the single slit diffraction pattern, it was stated that the intensity is zero at angle `n lambda//a`. Justify this by suitable dividing the slit to bring out the cancellation.

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Divide the single slit into n smaller slits of width `a. = a//n`. Each of the smaller slits sends zero intensity at angle `n lambda//a` will also be zero.
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