Wave front and Huygen’s principle, reflection and refraction of plane wave at a
plane surface using wave fronts. Proof of laws of reflection and refraction using Huygen’s
principle. Interference, Young’s double slit experiment and expression for fringe width,
coherent sources and sustained interference of light, diffraction due to a single slit, width of
central maximum, resolving power of microscope and astronomical telescope, polarisation,
plane polarised light, Brewster’s law, uses of plane polarised light and Polaroids.