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An image 2/3 of the size of the object is formed by a convex lens at a distance of 12 cm from it. Find the focal length of the lens. |
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Answer» Solution :The IMAGE formed is REAL (CONVEX lens forms `m=-2/3,v=+12cm,m=v/u-2/3` `-2u=36` `u=-18cm` `1/f=1/v-1/u` `1/f=1/12-1/(-18)` `=(3+2)/36` `f=36/5=7.2cm` |
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