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Find the half angular width of the centr...

Find the half angular width of the central bright maximum in the fraunhofer diffraction pattern of a slit of width `12xx10^(-5)cm` when the slit is illuminated by monochromatic light of wavelength 6000 Å.

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`becausesintheta=(lamda)/(a)" "theta=` half angular width of the central maximum
`a=12xx10^(-5)cm,lamda=6000Å=6xx10^(-5)cm`
`thereforesintheta=(lamda)/(a)=(6xx10^(-5))/(12xx10^(-5))=0.50impliestheta=30^(@)`
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