In a Young's double-slit experiment, light of wavelength 500 nm is used and the slit separation is 0.25 mm. If the angular fringe width is N mrad, find N.
Physics · Wave Optics · young's dubble slit experiments
JEE Mains NEET JEE Advanced

Question

In a Young's double-slit experiment, light of wavelength 500 nm is used and the slit separation is 0.25 mm. If the angular fringe width is N mrad, find N.

G1 Physics · Accepted Answer

Angular fringe width is Δθ = λ ÷ d. Thus, Δθ = 500×10⁻⁹ ÷ (0.25×10⁻³) = 2×10⁻³ rad = 2 mrad. Hence N = 2.