An object of height 10cm is placed in front of a convex lens of focal length 20cm. find the position and size of the image formed.
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Focal length, f = + 20 cm (It is a convex lens.) Thus, the image is formed at a distance of 20 cm from the convex lens (on its left side). Only a virtual and erect image is formed on the left side of a convex lens. So, the image formed is virtual and erect.
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