e/Nomarski prism

Information
has gloss	eng: A Nomarski prism is a modification of the Wollaston prism, which is used in differential interference contrast microscopy. The Polish physicist Georges Nomarski contributed to the development of Differential Interference Contrast microscopy, by developing the Nomarski prism. Like the Wollaston prism, the Nomarski prism consists of two optical quartz or calcite wedges cemented together at the hypotenuse (e.g. with Canada balsam). One of the wedges is identical to a conventional Wollaston quartz wedge and has the optical axis oriented parallel to the surface of the prism. The second wedge of the prism is modified by cutting the quartz crystal in such a manner that the optical axis is oriented obliquely with respect to the flat surface of the prism. The Nomarski modification causes the light rays to come to a focal point outside the body of the prism, and allows greater flexibility so that when setting up the microscope the prism can be actively focused.
lexicalization	eng: Nomarski prism
instance of	(noun) optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image optical prism, prism

Media
media:img	Wollaston-prism.png