Fermat's principle.

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Statement:-
“ A ray of light in passing from one point to another through a set of media by any no. of reflections or refractions chooses a path for which the time taken is either maximum or minimum(extremum) or constant in comparison to nearby paths.”

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What is Freundlich adsorption isotherm ?

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It is a device which is used to produce the plane polarised light. It is based on the principle of selective absorption and more effective than the tourmaline crystal. Polaroid allows the light oscillations parallel to the transmission axis to pass through them. The crystal or polaroid on which the unpolarised light is incident is called polariser. Crystal or polaroid on which polarised light is incident is called analyser.
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