Use the lens formula to show that Use the lens formula to show that f^2 = ab.

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Use the lens formula to show that $f^2 = ab$. $f^2$= square of focal length. a = object distance. b = image distance. I need help please.

The lens formular =$\frac{1}{f}=\frac{1}{a}+\frac{1}{b}$

How do I do that?

Edited by Chikis
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Hint: a and b are distances measured from focus in formula 1 and from optical centre in the other.

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