Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source (λ = 632.8 nm). The distance between the screen and the slits is 100 cm. If a bright fringe is observed on a screen at a distance of 1.27 mm from the central bright fringe, then the path diff…

Question

Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source (λ = 632.8 nm). The distance between the screen and the slits is 100 cm. If a bright fringe is observed on a screen at a distance of 1.27 mm from the central bright fringe, then the path difference between the waves, which are reaching this point from the slits is close to

Accepted Answer

(1) 1.27 μm. Δ = (yd)/D = (1.27 × 10⁻³ × 10⁻³)/1 Δ = 1.27 × 10⁻⁶ m = 1.27 μm (about 2λ, second bright fringe)

Step-by-step solution

Why the other options are wrong