Q. In Young's double slit experiment the distance between the slits is 1.9 mm. The distance between the slit and the screen is 1 m. If the bandwidth is 0.35 mm Compute the wavelength of the light used
Bandwidth β = D λ/ d
λ = β d / D
= 35 X 10 ^{-5} X 1.9 X 10 ^{-3} / 1
= 66.5 X 10^{ -8}m = 6650 A^{0}.