Ask iit jee aieee pet cbse icse state board community Discussion Response Post to: Utter confusion?Focal length of biconvex lens by ray optics and Lens makers formula
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sajal kumar (53)

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look it is nowhere written that f = R/2 for a lens...from lens maker formula u cannot get f = R/2 as focal lenght also depends on the refractive index of lens...... and from geometry we get f = R/2 for a spherical mirror....not for lens

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