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Find the focal length of the lens shwon...

Find the focal length of the lens shwon in figure
(a) If the light is incident form left side.
(b) If the light is incident form right side.

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(a) `(1)/(f) = (n_("net") - 1) ((1)/(R_(1)) - (1)/(R_(2))) = ((3)/(2) - 1) ((1)/(-60) - (1)/(-20))`
`f = 60cm`
(a) `(1)/(f) = (n_("net") - 1) ((1)/(R_(1)) - (1)/(R_(2))) = ((3)/(2) - 1) ((1)/(20) - (1)/(60))`
`f = 60cm`
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