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For an object placed at a distance 20 cm in front of a convex lens, the image is at a distance 20 cm behind the lens. The focal length of convex lens is : (a) 20 cm (b) 10 cm (c) 15 cm (d) 40 cm |
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Answer» For an object placed at a distance 20 cm in front of a convex lens, the image is at a distance 20 cm behind the lens. The focal length of convex lens is : (a) 20 cm (b) 10 cm (c) 15 cm (d) 40 cm |
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