An object is placed at some distance from a convex lens. If the image formed by the lens is three times the linear size of the object, find its distance from the lens. The focal length of the lens is 10cm.
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Here , f=15cm and 2f=30cm
(i) 20cm (Because a magnified real image is formed when the object is placed between f and 2f ).
(ii) 10cm ( Because a magnified virtual image is formed when the object is placed between f and the lens).
(iii) 35cm (Because a diminished real image is formed when the object is placed beyond 2f).
(iv) 30cm ( Because an image of same size as the object is formed when the object is placed at 2f).
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