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Show using a proper diagram how unpolarised light can be linearly polarised by reflection from a transparent glass surface. |
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Answer» <P> Solution : Plane POLARISED light can be obtained by reflection from a transparent surface (SAY a plane GLASS plate) when the light is incident on the surface at the polarising angle `i_(p)`, Value of polarising angle is given by Brewster.s law, according to which `tani_(p)=n or i_(p)=tan^(-1)(n)` In such a condition, the reflected light contains vibrations of electric vector perpendicular to the plane of incidence only and is thus, completely plane polarised one. |
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