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I'm struggling to find any information on this topic online. I've been asked to find the focal length of a biconvex lens with these specifications:

Refractive index: 1.5 Total Height: 7.5cm Radius of Curvature: 6cm

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closed as off-topic by Yashas, John Rennie, heather, Jon Custer, Emilio Pisanty Jul 23 '17 at 16:49

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