How do you calculate the focal length of a lens when it is placed into another medium, if I only have the focal length of a lens in the air? I understand that the lensmaker's equation should be used, but I'm not sure how it works.
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$\begingroup$ This might help - Lensmaker's equation for thick lens in two different media $\endgroup$– mmesser314Commented May 23 at 14:00
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