A single slit of width 0.1 mm is illuminated by parallel light of wavelength 6000 A, and diffraction bands are observed on a screen 40 cm from the slit. The distance of third dark band from the central bright band (in mm) is ______

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Question

A single slit of width 0.1 mm is illuminated by parallel light of wavelength 6000 A, and diffraction bands are observed on a screen 40 cm from the slit. The distance of third dark band from the central bright band (in mm) is _______.

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Using concept of Diffraction

$y = \frac{5 λD}{2 d} = \frac{5 \times 6000 \times 10^{- 10} \times 40 \times 10^{- 2}}{2 \times 0 .1 \times 10^{- 3}}$

= 6 mm.