1.

Direction of the first secondary maximum in the Fraunhofer diffraction pattern at a single slit is given by (a is the width of the slit)                                                       [KCET 1999]

A.            \[a\sin \theta =\frac{\lambda }{2}\]                              
B.            \[a\cos \theta =\frac{3\lambda }{2}\]
C.            \[a\sin \theta =\lambda \]     
D.            \[a\sin \theta =\frac{3\lambda }{2}\]
Answer» E.


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