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Optics is the study of light, and its interaction with matter. It includes topics such as imaging systems, fiber optics, lasers, quantum optics, and more.

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Which are the rays that form the fringes in wedge shaped film and Newton's rings?

First, in wedge-shaped film, in the book Optics by Ajoy Ghatak, p210, considering an extended source, the formation of fringes on the wedge is schematically shown by the following diagram. … But, while reading Optics by Hecht, 5th edition, for the same condition, this is the diagram given (p421). …
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