Showing posts with label Polarization. Show all posts
Showing posts with label Polarization. Show all posts

What are dextrorotatory and laevorotatory substances?

Dextrorotatory and laevorotatory substances are optically active substances.

Dextrorotatory  substances

Substances which rotate the plane of polarization of the light towards the right are known as dextrorotatory substances.

Laevorotatory substances

Substances which rotate the plane of polarization of the light towards the left are known as laevorotatory substances.

What is optical activity?

Optical activity

Optical activity is the ability of a substance to rotate the plane of polarization of plane polarized light. Substances which have this ability are called optically active substance. Tartaric acid is an example of optically active liquid.

What is nicol prism?

Nicol prism

Nicol prism was invented by William Nicol in 1828. It is an optical device used for producing and analyzing plane polarized light. The nicol prism is made in such a way that it eliminates one of the two rays by total internal reflection. It is generally found that it eliminates the ordinary ray and only the extraordinary ray is transmitted through the prism.

What do you understand by double refraction?

Double refraction

Erasmus Bartholinus discovered in 1669, that, when a ray of light is refracted by a crystal of calcite it gives two refracted rays. This phenomenon is called double refraction. Calcite is crystallized calcium carbonate (CaCO3). It crystallizes in many forms and can be reduced by cleavage or breakage into a rhombohedra.