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Shows a thin lens with centres of curvat...

Shows a thin lens with centres of curvature `C_1 and C_2`. If `mu = 1.5`, what is its focal length ?
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Shows a concavo convex lens with `R_1 = + 10 cm , R_2 = + 20 cm`
`(1)/(f) = (mu - 1)((1)/(R_1) - (1)/(R_2))`
=`(1.5 - 1)((1)/(10) - (1)/(20)) = (1)/(40) :. f = 40 cm`.
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