In this device, light from a sodium lamp falls on a glass plate inclined at 45 degrees to the horizontal, is reflected, and then falls normally on a convex lens placed over a glass plate. A set of bright and dark concentric circular rings is seen through a microscope arranged vertically above the glass plate. The microscope is properly focused so that the alternating bright and dark rings are observed more clearly. Measurements are taken with a micrometer-driven travelling microscope coordinated with the apparatus.

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