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[" A ray of light travelling in the direction "(1)/(2)(hat i+sqrt(3)hat j)" is incident on a plane mirror.Atter reflection,it travels "],[" along the direction "(1)/(2)(hat i-sqrt(3)hat i)" .The angle of incidence is: "quad " [JEE-2013(Advanced); "360,-1]],[[" (A) "30^(@)," (B) "45^(@)," (C) "60^(@)," (D) "75^(@)]]

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