1.

In a diffraction pattern due to a single slit of width a, the first minimum is observed at an angle `30^(@)` when light of wavelength 5000 Å is incident on the slit. The first secondary minimum is observed at an angle ofA. `sin^(-1)(3/4)`B. `sin^(-1)(1/4)`C. `sin^(-1)(2/3)`D. `sin^(-1)(1/2)`

Answer» Correct Answer - A
`a=sin 30^(@)=1implies a=2lambda`
`1st` secondary maximum
`a sin theta_(1)=(3lambda)/2 sin theta_(1)=(3lambda//2)/(2 lambda)=3/4`
`theta_(1)=sin^(-1)(3//4)`


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