A convex lens has focal length of 30 cm. at what distance should object be placed from the lens so that it forms an image at 60 cm on other side of the lens? Find the magnification produced by the lens. ( v=- 60cm, m = -1)
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Say, the object is at distance of infinity from the lens so a real image is formed at a distance of f on the other side of lens. As the object approaches lens , coming upto a distance of 2f, the image will move away from the lens. It will be real, inverted and smaller in size than than the object. Once the object reaches at a distance of 2f, the image will also be at a distance of 2f and of the size of the object. For object in the range of 2f and f, the image will be in the range of 2f and infinity.
As the object gets any closer than f to the lens, we get an enlarged virtual image, which gets smaller as the object reaches lens. As the object nearly touches lens it is just like looking it through a glass slab.
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