Wave Optics - Result Question 27

29. 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\AA is incident on the slit. The first secondary maximum is observed at an angle of :

[2016]

(a) sin1(14)

(b) sin1(23)

(c) sin1(12)

(d) sin1(34)

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Answer:

Correct Answer: 29. (d)

Solution:

  1. (d) For the first minima,

θ=ηλasin30=λa=12 First secondary maxima will be at

sinθ=3λ2a=32(12)θ=sin1(34)



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