In this device, light from a sodium light falls on the glass plate, slanted at 45 degree to the horizontal, get reflected, and after that falls ordinarily on the convex lens put over the glass plate. An arrangement of brilliant and dim concentric circular rings are seen through a magnifying lens, organized vertically over the glass plate. The magnifying lens is appropriately focussed so that alternate bright and dark concentric circular rings are observed more clearly.. Estimations are taken from a micrometer driven travelling microscope, which is coordinated with this apparatus.
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