A parallel beam of unpolarised light is incident on a plane glass surface at an...
PHYSICS
WAEC 2004
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
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