(i) AJse Huygens' geometrical construction to show how a plane wavefront at t = 0 .propagates and produces a wavefront at a later time.(ii) Verify, using Huygens' principle, Snell's law of refraction of a plane wave propagating from a denser to a rarer medium.(iii) When monochromatic light is incident on a surface separation two media, the reflected and refracted light both have the same frequency. Explain

Question

(i) AJse Huygens' geometrical construction to show how a plane wavefront at t = 0 .propagates and produces a wavefront at a later time.
(ii) Verify, using Huygens' principle, Snell's law of refraction of a plane wave propagating from a denser to a rarer medium.
(iii) When monochromatic light is incident on a surface separation two media, the reflected and refracted light both have the same frequency. Explain why?