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[" (a) "60^(@)" (b) "30^(@)" (c) "90^(@)" (d) "0^(@)],[" 18.At two points "P" and "Q" of screen in YDSE,waves "],[" from slits "S_(1)" and "S_(2)" have a path difference of "0" and "24" ."],[(lambda)/(4)" respectively.The ratio of intensities at "P" and "Q],[" will be: "],[[" (a) "2:1," (b) "sqrt(2):1," (c) "4:1," (d) "3:2]]

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