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Find the focal length of a plance-conve...

Find the focal length of a plance-convex lens with `R_(1) = 15cm` and `R_(2) = oo`. The refractive index of the lens material `n = 1.5`

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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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