A beam of light of wavelength 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

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A beam of light of wavelength 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 fringe on either side of the central bright fringe is

TestHub · Accepted Answer

The distance between the central bright fringe and the first dark fringe is given as: y nd ​ y I d ​ ​ ​ = d n λ D ​ = 1 0 − 5 1 × 600 × 1 0 − 6 × 2 ​ = 1.2 × 1 0 − 3 = 1.2 mm ​ ∴ The distance between the first dark fringe on either side of the central bright fringe is 2 y n ​ = 2 × 1.2 = 2.4 mm

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