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Distinguishbetween unpolarised and plane polarisedlight. An unpolarisedlight is incident on the boundary between two transparent media.State the consition when the reflected wave is totally plane polarised. Find out the expression for the angle of incidence in this case. |
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Answer» Solution :The independent light waves whose planes of vibrations are randomly ORIENTED about the direction of propagation are SAID to be unpolarised. When the light waves TRANSMIT only one component parallel to a special axis, then the resulting light is called plane polarised or lineraly polarised light. When reflected WAVE is PERPENDICULAR to the refracted wave, the reflected wave is totally polarised wave. The angle of incidencein this case is called Brewster's angle and is denoted by `i_(B)`. The relation between incidence angle `i_(B)` is given by `mu= tan i_(B)`. |
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