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When an object is at distance x and y from a lens, a real image and a virtual image is formed respectively having some magnification. The focal length of the lens is (a) (x+y)/2 (b) x – y(c) √xy (d) x + y |
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Answer» When an object is at distance x and y from a lens, a real image and a virtual image is formed respectively having some magnification. The focal length of the lens is (a) (x+y)/2 (b) x – y (c) √xy (d) x + y |
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