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Concave lens – Principal focal length and centre of curvatur
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A plano - convex glass lens (mug = 3/2) of radius of curvature R = 10 cm is placed at a distance of 'b' from a concave lens of focal length 20
File:Convex lens - Object on Centre of curvature.png - Wikimedia Commons
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As the radius of curvature for a lens increases, its curvature and, the focal length .
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/radius-of-curvature-(r)-3-1.b6bf4f6.jpg "Concave lens – radius of curvature (`R`)")