A beam of light of wavelength 600 n m from a distant source falls on a single slit 1 m m 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 central bright fringe is

Question

A beam of light of wavelength 600 n m from a distant source falls on a single slit 1 m m 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 central bright fringe is, 1.2 c m, 1.2 m m, 2.4 c m, 2.4 m m

MARKS App · Accepted Answer

The distance between the first dark fringes on either side of central bright fringe is ⇒ 2 y = 2 D λ a ⇒ 2 y = 2 × 2 × 6 × 1 0 - 7 1 × 1 0 - 3 ⇒ 2 y = 24 × 1 0 - 4 m ⇒ 2 y = 2.4 m m

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