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nov 12, 2011 q1 in which type of lens linear magnification is always less then one? answer concave lens always has linear magnification less than one, because it always gives diminished images. q2 john obtained a magnification of 1 with concave mirror of focal length 10cm. what is the object distance from mirror? answer m = 1.therefore u = v. apply it in mirror formula, you will get v = 20 cm.

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