Optics Problems - Numerical 31

A glass plate (m= 1.5) is used as a polarizer. Obtain the polarizing angle of incidence. What is the angle of refraction when the reflected light is plane polarized?

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Suggested solution:

Suggested solution:

According to Brewster's law, the polarizing angle of incidence i_p is

m = tan i_p or 1.5 = tan i_p

.. i_p = tan^-¹(1.5) = 56.3⁰

When light is incident at the polarizing angle of incidence, the reflected beam is perpendicular to the transmitted beam. If r is angle of refraction, i_p + r = 90⁰ r = 90 56.3 = 33.7⁰