Question: Two rectangular pieces of plane glass are laid one upon the other on a table. A thin strip of paper is placed between them at

Two rectangular pieces of plane glass are laid one upon the other on a table. A thin strip of paper is placed between them at one edge so that a very thin wedge of air is formed. The plates are illuminated
at normal incidence by 546-nm light from a mercury vapor lamp. Interference fringes are formed, with 15.0 fringes per centimeter Find the angle of the wedge.

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