Question

Monochromatic green light of wavelength 5 × 10^-7 m illuminates a pair of slits 1 mm apart. The separation of bright lines in the interference pattern formed on a screen 2 m away is ______.

Options

• 0.25 mm

• 0.1 mm

• 1.0 mm

• 0.01 mm

Answer 1

Monochromatic green light of wavelength 5 × 10^-7 m illuminates a pair of slits 1 mm apart. The separation of bright lines in the interference pattern formed on a screen 2 m away is 1.0 mm.

Explanation:

λ = 5 × 10^-7 m, d = 10^-3 m, D = 2 m

Separation of bright lines = fringe width

= `(lambdaD)/d`

= `(5 xx 10^-7 xx 2)/10^-3`

= 10 × 10^-4 m

= 10^-3 m

= 1 mm