1.

etweel ue pole of thĂŠ mirror and its principal tocus.Where should an object be placed in front of a convex lens to get asize of the object?(a) At the principal focus of the lensb) At twice the focal length(c) At infinityd) Between the optical centre of the lens and its priscipai ocusand a thin spherical lens have each a foral engit d

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