Using a wavelength of λ = 2.85cm, a slit separation of d = 5cm and a slit width of a = 1cm. (a) Determine the location of the first interference peaks (ignoring diffraction) on an infinitely long screen placed 20cm from the slits. (b) What is the minimum slit separation required to also observe the second order interference peaks on the same screen? c) Generally when the interference (1) and diffraction (2) equations are discussed a small angle approximation is applied, is this approximation still valid when working this system

Using a wavelength of λ = 2.85cm, a slit separation of d = 5cm and a slit width of a = 1cm. (a) Determine the location of the first interference peaks (ignoring diffraction) on an infinitely long screen placed 20cm from the slits. (b) What is the minimum slit separation required to also observe the second order interference peaks on the same screen? c) Generally when the interference (1) and diffraction (2) equations are discussed a small angle approximation is applied, is this approximation still valid when working this system