The focal length of a convex lens is f an object is placed at a distance x from the first focal point .Find the ratio of the distance of the real image
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![Gujrati] Explain first focal centre and second focal centre for lens.](https://d10lpgp6xz60nq.cloudfront.net/physics_images/KPK_AIO_PHY_XII_P2_C09_E01_037_S01.png "Gujrati] Explain first focal centre and second focal centre for lens.")
Gujrati] Explain first focal centre and second focal centre for lens.
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