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What is Brewster's angle ? Derive relation between Brewster angle and refractive index of medium which produces Plane Polarised light. |
Answer» Solution :Brewster.s angle (or polarising angle) is the angle of incidence `.i_(p).` at a PLANE surface so that reflected light is completely plane polarised.  When light is incident at the polarising angle `i_(p)`, the reflected and refracted RAYS make a right angle with each otheri.e., `angle r=angle(90^(@)-i_(p))`. THEREFORE, as per Snell.s law, we have `n=(sini_(p))/(sin r)=(sin i_(p))/(sin (90^(@)-i_(v)))=(sin i_(p))/(cosi_(p))=tani_(p)` |
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