1.

The magnification of an object placed in front of a convex lens of focal length 20 cm is +2 . To obtain a magnification of −2, the object will have to be moved a distance equal to

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The magnification of an object placed in front of a convex lens of focal length 20 cm is +2 . To obtain a magnification of 2, the object will have to be moved a distance equal to



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