This simple apparatus nicely demonstrates Newton's rings. It consists of a slightly convex lens, mounted against a flat glass plate. Interference fringes, known as Newton's rings, can be observed as a series of light and dark concentric circles around a central dark spot where the lens and glass plate meet. This phenomenon is usually observed using a monochromatic light source such as a sodium lamp. The pressure on the glass can be varied by using the fitted screws. Glass Dimensions (Dia.): 60mm. Please note: a sodium light source and low power microscope e.g. a vernier or travelling microscope will be required to see the rings properly.

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