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]

\[a\sin \theta =\frac{\lambda }{2}\]

\[a\cos \theta =\frac{3\lambda }{2}\]

\[a\sin \theta =\frac{3\lambda }{2}\]

Direction of the first secondary maximum in the Fraunhofer diffraction

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.	X-rays
D.	\[a\sin \theta =\frac{3\lambda }{2}\]
Answer» E.

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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]

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