Immagini

DESCRIPTION

Exhibit 441 is a double image prism (Wollaston prism) composed of two rectangular prisms of birefringent material such as calcite with the optic axes perpendicular between them. The two prisms are glued together with Canada balsam so as to form a parallelepiped fixed on a metallic base, soldered to a rod and supported by a stand. There is a screen with a central hole fixed to the stand to provide a well collimated beam of light on the prisms.

A beam of white light incident normally on the surface of the first prism transits perpendicular to the optic axis until it reaches the second prism where it is doubly refracted. The two linearly polarized rays, (ordinary O and extraordinary E) are deviated at different large angles due to the different indices of refraction (see design 1)

In another configuration (Rochon prism, design 2) the ordinary ray is parallel to the incident ray while the extraordinary ray E is deviated. In this configuration, the separation between the two rays is less.

ISCRIZIONI

1. È inciso: "Soleil - RUE DE L'ODEON - "Paris"

BIBLIOGRAPHY

• [1] Jenkins & White, Fundamentals of Optics, McGRAW-HILL Book Company, New York, 1957
• [2] D.N. Vasudeva, "A Text Book of LIGHT", Atma Ram & Sons, Delhi, IV Edition, 1959, pag. 436
• [3] E.Hecht - Optics - Third edition - Addison-Wesley Longman, Inc. - 1998

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