White light is incident on a pair of thin Young's slits separated by a distance of 0.2 mm. An interference pattern is observed on a screen placed 5 m from the slits.
(1) Explain why the central maximum of the interference pattern is white.
(2) Explain why the maxima on either side of the central maximum are not white.
(3) Explain why red light is observed on the screen at larger angles than blue light.
(4) Determine the average separation of maxima on the screen given that green light has a wavelength of about 500 nm.