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Light of wavelength 6328Å is incident no...

Light of wavelength `6328Å` is incident normally on slit having a width of `0.2mm`The width of the central maximum measured form minimum to minimum of diffraction pattens on a screen `9.0meter`away will be about-

A

`0.36^(@)`

B

`0.18^(@)`

C

`0.72^(@)`

D

`0.09^(@)`

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