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Q. The magnification of an image by a convex lens is positive only when the object is placed

KEAMKEAM 2016Ray Optics and Optical Instruments

Solution:

The magnification of an image by convex lens is positive only when the object is placed between focal point $(F)$ and optical centre because image formed by the convex lens for this location of the object is virtual and magnified and for real image $m=-$ ve. For virtual image, $m=+ ve$