In a single slit diffraction experiment first minimum for red light (660 nm ) coincides with first maximum of some other wavelength λ λ '. The value of λ λ ' is
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A
In a single slit diffraction experiment, position of minima is given by 
So for first minima of red 
and as first maxima is midway between first and second minima, for wavelength 
,
its position will be
According to given condition 
so 
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