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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