A parallel beam of unpolarised light is incident on a plane glass surface at an angle of 58(^{o}) to the normal. If the reflected beam is completely polarised, calculate the refractive index of the glass.
Explanation
When i = 58°, r = 90′ – 58° = 32°
n = (frac{sin i}{sin r}) = (frac{sin 58^o}{sin 32^o})
= 1.60