A Novel Prism for Total Reflection

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Abstract
For purposes of autocollimation alignment a reflection prism has been developed with certain advantages over the triple mirror (corner-cube). Not only is the parallelism of the incident and emergent rays (travelling in opposite directions) independent of the orientation of the prism, but it is also possible to conserve much better the state of polarization. This makes the prism useful for the determination of the optical thickness of thin layers in vacuo by means of Savart's plates in autocollimation. Some advantages and disadvantages are discussed.

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