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Direction of the first secondary maximum...

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)

A

`asintheta=(lamda)/(2)`

B

`acostheta=(3lamda)/(2)`

C

`asintheta=lamda`

D

`asintheta=(3lamda)/(2)`

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The correct Answer is:
D
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