Question

The angle of polarisation for retlection is 59°. Find the critical angle.


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Answer 1

Answer:

90o

The polarization angle ( also called Brewster's angle)is defined as the angle of incidence at which light with a particular polarization is perfectly transmitted through a transparent dielectric surface with no reflection

Brewster's Law states that  the tangent of the angle of polarization is numerically equal to the refractive index of the medium.

μ = tan i (1)

From Snell's law:

(2)

Comparing (1) and (2)

cos i = sin r = cos (2π - r)

i.e. i = (2π - r)

So, i + r = 2π

So, as seen from the diagram, if i + r = 90o Then the angle between reflected ray and refracted ray will be 180o - 90o = 90o