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Light of wavelength 6328 Å is incident n...

Light of wavelength 6328 Å is incident normally on a slit of width 0.2 mm. Calculate the angular width of central maximum on a screen distance 9 m?

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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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