While sitting in a boat on a sunny day, an observer notices strong glare from the water surface. The refractive index of water is 1.33.
(i) Calculate the angle of incidence (measured from the normal to the surface) at which the reflected light from water will be completely plane-polarised.
(ii) At what angle above the horizontal should the observer look to see the point on the water surface where the glare is minimised?
(iii) Ordinary polarising sun-glasses have their polarising axes oriented vertically. Explain how this orientation helps in reducing the observed glare from horizontal water surfaces.