Question

Formula of angular width of double slit experiment

Answer 1

Strategy. From the given information, and assuming the screen is far away from the slit, we can use the equation ... (a) Find the angle of the third diffraction minimum for 633-nm light falling on a slit of width \text{20 ... Given, Angular width of a fringe = 0.2o Wavelength of light used, λ = 600 nm Refractive index of water, μ = 43 Angular fringe separation, θ = λd or d = λθ In water, d = λ'θ' ∴ λθ = λ'θ'⇒ θ'θ =λ'λ =1μ = 3/4

Answer 2

• Derive the formula ω=2Dλ for fringe width in Young's double slit experiment.

• The symbols used have their usual meanings.