A beam of light ( 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 the first dark fringes on either side of the central bright fringe is

Question

A beam of light ( 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 the first dark fringes on either side of the central bright fringe is, 1.2 cm, 1.2 mm, 2.4 cm, 2.4 mm

MARKS App · Accepted Answer

Distance between 1 s t order dark fringes = width of principle maximum X = 2 λ D d = 2 × 600 × 10 - 9 × 2 10 - 3 = 2400 × 10 - 6 = 2 .4 × 10 - 3 m = 2 .4 mm

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