In a Young's double slit experiment, the spacing between the slits is 0.3 mm and the screen is kept at a distance of 1.5 m. The second bright fringe is found 6 mm from the central fringe. The wavelength of the light used in the experiment is?
625 nm
600 nm
550 nm
500 nm
Solution:
Given: D = 1.5 m d = 0.3 mm 2λD/d = 6 mm => λ = d × 6 / 2D nm => λ = 0.3 × 10⁻³ × 6 × 10⁻³ / (2 × 1.5 × 10⁹) nm This gives, λ = 600 nm