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[" A concave mirror forms a real image t...

[" A concave mirror forms a real image three times larger than the object on a screen.Object and screen are moved "],[" until the image becomes twice the size of object.If the shift of object is "6cm" .The shift of the screen & focal "],[" length of mirror are "],[[" (A) "36cm,36cm," (B) "36cm,16cm]]

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