Find the position, nature and size of the image formed by a convex lens of focal length 20 cm of an object 4 cm high placed at a distance of 30 cm from it.
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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. ... Thus, the height or size of the image is 8 cm
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