A narrow slit of width 1 mm is illuminated by monochromatic light of wavelength 60 nm . The distance between the first minima on either side of a screen at a distance of 2 m is

Question

A narrow slit of width 1 mm is illuminated by monochromatic light of wavelength 60 nm . The distance between the first minima on either side of a screen at a distance of 2 m is, 1 . 2 cm, 1 . 2 mm, 2 . 4 cm, 2 . 4 mm

MARKS App · Accepted Answer

For first dark fringe on either side dsin ⁡ θ = λ or dy D = λ ∴ y = λD d Therefore distance between two dark fringes on either side = 2 y = 2 λD d Substituting that values, we have Distance = 2 600 × 10 - 6 mm 2 × 10 3 mm 1 .0 mm = 2 .4 mm

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