JEE Main 2017 · 9 Apr · Shift 1 · Physics Q23

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PhysicsSingle correct+4 / -1Question 23 of 90

A single slit of width 0.1 mm is illuminated by a parallel beam of light of wavelength 6000 Å and diffraction bands are observed on a screen 0.5 m from the slit. The distance of the third dark band from the central bright band is :

3 mm

9 mm

4.5 mm

1.5 mm

Answer and worked solution

Official answer: B

$y_3=\dfrac{3\lambda D}a=\dfrac{3\times6\times10^{-7}\times0.5}{10^{-4}}=9\times10^{-3}$ m = 9 mm.

Topics:Diffraction

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JEE Main 2017 · 9 Apr · Shift 1, Physics question 23