Two slits are made 3 mm apart and the screen is placed 2 m away. What is the fringe separation when blue-green light of wavelength 600 nm is used?

Question

Accepted Answer

(1) 0.4 mm. Given: d=3 mm=3×10⁻³ m, D=2 m, λ=600 nm=6×10⁻⁷ m. Idea: consecutive bright fringes in Young's experiment are separated by the fringe width β=(λ D)/d. β=(6×10⁻⁷×2)/(3×10⁻³). (6×2)/3=4 and (10⁻⁷)/(10⁻³)=10⁻⁴. β=4×10⁻⁴ m=0.4 mm.

Two slits are made 3 mm apart and the screen is placed 2 m away. What is the fringe separation when blue-green light of wavelength 600 nm is used?

Step-by-step solution

Why the other options are wrong