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IF a pair of optically flat plates, making a wedge angle of a few seconds, be placed in the beam from a collimator with a cross slit (to obtain effectively a point source) and the eye be
placed at the focal plane of the telescope objective (without eyepiece), straight fringes are seen which are localised at the plates. Essentially they are the fringes observed by Fizeau, who
used a back reflection method.
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