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In a Fraunhofer diffraction experiment a...

In a Fraunhofer diffraction experiment at single slit using a light of wavelength 400 nm , the first minimum is formed at an angle of `30^(@)` . The direction `theta` of the first secondary maximum is given by

A

`tan^-1 2//3`

B

`sin^-1 1//4`

C

`sin^-1 3//4`

D

`sin^-1 2//3`.

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