NEET | 2016Wave OpticsHard

Question

In a diffraction pattern due to a single slit of width ‘a’, the first minimum is observed at an angle 30o whenlight of wavelength 5000 Aois incident on the slit. The first secondary maximum is observed at an angle of:

Options

A.

sin-114

B.

sin-123

C.

sin-112

D.

sin-134

Solution

a sin 30 = λ
a sin θ=3λ2
sin θsin 30=32
sin θ=32×12
sin θ=34
θ=sin 34

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