Consider the double slit arrangement shown in the figure below, where the slit separation is d and the distance between the slit and the screen is L. A sheet of transparent plastic with refractive index n and thickness t is placed over the upper slit. As a result, the central maximum of the interference pattern moves upward at a distance y'. Find y'.

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A: YOUNG'S DOUBLE SLIT

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.