1.

Light of wavelength \[589.3\,nm\] is incident normally on the slit of width \[0.1\,mm.\] What will be the angular width of the central diffraction maximum at a distance of \[1\,m\] from the slit                                                   [BHU (Med.) 1999]

A.            \[0.68{}^\circ \]                   
B.            \[1.02{}^\circ \]
C.            \[0.34{}^\circ \]                   
D.            None of these
Answer» B.            \[1.02{}^\circ \]


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