Abstract
When the rays emerging from a Jamin interferometer are reflected back through the instrument, fringes similar in appearance and behaviour to three-beam fringes are obtained. These fringes can be used to measure small angular displacements of one of the beam-dividing plates, with an accuracy of the order of 0.01. A modified setup is also described with which angular displacements of a comparatively light, auxiliary mirror can be measured with the same degree of accuracy.
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