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    Hello everyone!

    Our teacher asked us to draw a biconvex lens with following parameters:

    n1 = 1
    n2 = 1,5
    r1 = 4 cm
    r2 = 10 cm
    d = 2 cm
    (please see the picture for reference - I'm not sure what letters are used in the UK )

    I have trouble with finding the focal points, as my "e" came out to be -15 cm and an A4 paper seems to be too small (which is suspicious). Could someone please try and tell me, whether I'm doing something wrong?

    Thank you in advance!
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