Sunday, 19 August 2012

Fresnel's Theory of Optical Activity, Fresnel's Theory


When a Polarizer and an analyzer are crossed, no light comes out of the analyzer. When a quartz plane cut with its faces parallel to the optic axis is introduced between N1 and N2 in such a way that light falls normally on the quartz plate, then light comes out of N1 and N2. It means that plane of vibration of the plane polarized light changes (rotate) when it passes through any substances. This property of rotating the plane of vibration by a substance is known as "Optical Activity".

There are two types of optically active substance
(i) Right handed or dextro-rotatory
(ii) Left handed or leave-rotatory

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