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Wave Optics

  1. A beam of light of λ = 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is:
    1. 1.2 cm
    2. 1.2 mm
    3. 2.4 cm
    4. 2.4 mm
Correct Option: D

Given: D = 2m; d = 1 mm = 1 × 10– 3 m
​λ = 600 nm = 600 × 10– 6 m ​
Width of central bright fringe (= 2β)

=
2λD
=
2 × 600 × 10-6 × 2
m
d1 × 10-3

= 2.4 × 10– 3 m = 2.4 mm



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