I am doing my revision and there's such a question. However, when I tried to plug the values into the lensmaker formula, I find that one of the R is equal to zero, as it is not curved.
$(n_2 -n_1)(1/r_1 - 1/r_2)$
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3A flat surface has a radius of infinity, not zero... – DJohnM Jun 10 '13 at 01:37
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@User58220 that should probably be expanded into an answer – David Z Jun 10 '13 at 03:07
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2I don't see what more there is to say: a simple misunderstanding corrected... – DJohnM Jun 10 '13 at 06:55