Monochromatic light of wavelength 400 nm is incident normally on a single slit of width 5.0 μm .
(a) What colour is the light?
(b) Determine the angular width of the central maximum of the diffraction pattern.
(c) Determine the actual width of the central maximum on a screen that is placed 4.0 m away from the slit.
(d) If the light is replaced by light of wavelength 600 nm, how will your answers to parts a, b and c change?