Wave Optics - Result Question 30

32. A beam of light of λ=600nm from a distant source falls on a single slit 1mm wide and the resulting diffraction pattern is observed on a screen 2m away. The distance between first dark fringes on either side of the central bright fringe is:

(a) 1.2cm

(b) 1.2mm

(c) 2.4cm

(d) 2.4mm

[2014]

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Answer:

Correct Answer: 32. (d)

Solution:

(d) Given: D=2m;d=1mm=1×103m

λ=600nm=600×106m

Width of central bright fringe (=2β) =2λDd=2×600×106×21×103m

=2.4×103m=2.4mm



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