Word Count : 276

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In Young’s double slit experiment, coherent light from a source passes through two closely spaced slits, producing an interference pattern of bright and dark fringes on a screen due to constructive and destructive interference of the two light waves. When a thin glass plate of thickness *t* and refractive index *μ* is introduced in the path of one of the two interfering waves, it changes the optical path length ____ ________ ______ _______ __________ ______ _______ _______.
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