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[" 2.An object placed in front of a conc...

[" 2.An object placed in front of a concave mirror of "],[" focal length "20cm" produces a virtual image which "],[" is twice the size of the object,find where it is "],[" placed? "],[[" (a) "10cm," (b) "20cm," (c) "-10cm" ( "d" ) "-20cm]]

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