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CBSE Class 12-science Answered

For which position of the object magnification of convex lens is minus one
Asked by rakeshgowda51088 | 01 Mar, 2019, 08:53: PM
answered-by-expert Expert Answer
magnification  (v/u) = -1  , where v is lens-to-image distance and u is lens-to object distance.
 
hence we get v = -u
 
if we substitute v = - u in lens equation   (1/v)-(1/u) = (1/f),  we get  -(1/u) - (1/u) = 1/f   or u = -2f 
 
hence if object is placed at a distance 2f, we get magnification of image -1
Answered by Thiyagarajan K | 01 Mar, 2019, 10:04: PM

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