The interference pattern observed in Newton's rings experiment is because of the path difference between the top surface and the bottom surface of the air between the pieces of glass.

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The interference pattern observed in Newton's rings experiment is due to the path difference between the top and bottom surfaces of the air film formed between the curved surface of a plano-convex lens and a flat glass plate pressed against it. The path difference leads to constructive and destructive interference of the incident light, resulting in a pattern of bright and dark rings.

The Interference Pattern Observed in Newton's Rings Experiment Is Because