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2015-11-25T19:42:41+05:30

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Its between the centre of curvature and pole.
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2015-11-25T19:53:25+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
A focus of a concave lens is very similar to a focal point of a concave mirror. Imagine many light rays pointed towards a lens, all parallel to each other. When the light rays reach the lens, they will either all refract away from each other or towards each other . In the convex case, the point the rays all converge at is called the focus, and the distance from this point to the lens is the focal length.
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