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The radius of curvature of the curved su...

The radius of curvature of the curved surface of a plano-convex lens is `20 cm`. If the refractive index of the material of the lens be `1.5`, it will

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`(1)/(f) = (n-1) ((1)/(R_(1)) - (1)/(R_(2))) = (1.5-1) ((1)/(15)-(1)/(oo)) = 0.5xx(1)/(15)`
`:. F = 30cm`
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