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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:
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- 1.2 cm
- 1.2 mm
- 2.4 cm
- 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)
= | = | m | ||
d | 1 × 10-3 |
= 2.4 × 10– 3 m = 2.4 mm