If the light is completely polarized by reflection, then angle between the reflected and refracted light isa)πb)2πc)π/2d)π/4Correct answer is option 'C'. Can you explain this answer?

Question

If the light is completely polarized by reflection, then angle between the reflected and refracted light isa)&#960;b)2&#960;c)&#960;/2d)&#960;/4Correct answer is option 'C'. Can you explain this answer?

Answer

This is in accordance with Brewsters law. When light is incident. When light is incident at Brewsters angle then the refracted and reflected ray are perpendicular to reach other.

Answer

90 degrees

Answer

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:
μ = sinr sini ....................(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 = 90^o Then the angle between reflected ray and refracted ray will be 180^o - 90^o = 90^o

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