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[" Interference fringes are produced on a screen by "],[" using two light sources of intensities I and "9" .The "],[" phase difference between the beams is "(pi)/(2)" at point "P],[" and "pi" at point "Q" on the screen.The difference "],[" between the resultant intensities at point Pivid "Q" is "],[[" (a) "21," (b) "4I," (c) "6]]

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