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In a diffraction pattern due to a single...

In a diffraction pattern due to a single slit of width 'a' the first minimum is obsrved at an angle `30^@` When light of wavelength `5000 overset@A` is incident on the slit.The first secondary maximum is oberved at an angle of :

A

`sin^-1(3/4)`

B

`sin^-1(1/4)`

C

`sin^-1(2/3)`

D

`sin^-1(1/2)`

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