A

David

Darling

Wollaston prism

The Wollaston prism is a device, invented by William Wollaston, that separates randomly polarized or unpolarized light into two orthogonal linearly polarized beams that exit the prism at an angle determined by the wavelength of the light and the length of the prism. Wollaston prisms are used in some kinds of polarimeter.

Wollaston prism