Abstract
Half of the central fringe of Lloyd's single-mirror system can be seen directly if the fringes are observed in a plane passing through the edge of the mirrors, and if the mirror is of ordinary, not black, glass and has a cleanly cut edge which is illuminated by light shining on to the opposite edge. The use of mica to displace the fringe system is not valid, since the central fringe will be displaced more for blue light than for red. This dispersion of the central fringes for the different colours may produce a displaced white-light system approximately symmetrical about a black fringe, but this black fringe will not be produced by the coincidence of the displaced central fringes. It is equally possible to find a thickness of mica which gives a displaced system symmetrical about a white fringe. The phase change on reflection at a less dense medium at grazing incidence is shown to be in the region of π, since a system with a black central fringe is formed when the mirror is immersed in carbon bisulphide.
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