In a Young's double-slit experiment, monochromatic light of wavelength 600 nm is used. The slit separation is 0.50 mm and the screen is 1.5 m from the slits. If the fringe width is (N ÷ 10) mm, find N.
Physics · Wave Optics · young's dubble slit experiments
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Question

In a Young's double-slit experiment, monochromatic light of wavelength 600 nm is used. The slit separation is 0.50 mm and the screen is 1.5 m from the slits. If the fringe width is (N ÷ 10) mm, find N.

Physics · Wave Optics · young's dubble slit experiments

G1 Physics · Accepted Answer

Fringe width is β = λD ÷ d. Substitute: λ = 600×10⁻⁹ m, D = 1.5 m, d = 0.50×10⁻³ m. Thus, β = 1.8×10⁻³ m = 1.8 mm = 18 ÷ 10 mm. Hence N = 18.