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Light of wavelength 6328 Å is incident n...

Light of wavelength `6328 Å` is incident normally on a slit having a width of `0.2mm` The width of the central maximum on a screen 9m away will be nearly

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Given `lamda=6.328xx10^(-7)m,a=0.2xx10^(-3)m`
`w_(theta)=(2lamda)/(a)=(2xx6xx328xx10^(-7))/(2xx10^(-4))` radian `=(6.328xx10^(-3)xx180)/(3.14)=0.36^(@)`
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