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Very Short Question (JA convex lens forms a virtual image when anobject is placed at a distance of 20cm from it.The focal length is: a). 40cm; b). 20cm; c).>20cm; d). <20cm.mirror at |
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Answer» A virtual image is formed by convex lens only when the object is placed between focus and lens. Here object is placed at 20 cm from lens. Hence, the focal length of lens is greater than 20 cm but less than 40 cm. (c) is correct option |
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