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Find the focal length fo the lens shown ...

Find the focal length fo the lens shown in the figure.

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`:' (1)/(f) = (n_(net) - 1) ((1)/(R_(1)) - (1)/(R_(2)))`
`rArr (1)/(f) = (3//2-1) ((1)/(10) - (1)/((-10))) rArr (1)/(f) = (1)/(2) xx (2)/(10) rArr f = + 10cm`
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RESONANCE-GEOMATRICAL OPTICS -Advance level Problems
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  15. A small ball is thrown from the edge of one bank of a river of width 1...

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