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In the young’s double slit experiment and interference pattern of bright and dark fridges was formed as shown in figure 1 by a light of wavelength 𝛾 coming from two narrow slits X and Y.
(a) Write an expression for the path difference between XP and YP where P corresponds to the 2nd bright fringe.
(b) Explain how the dark and bright fringes are formed.
(c) State and explain what would be observed on the screen if the slits X and Y were made large.