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

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Offline Chikis

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Use the lens formula to show that f^2 = ab
« on: 17/07/2014 02:41:18 »
 Use the lens formula to show that [tex]f^2 = ab[/tex]. [tex]f^2[/tex] = square of focal length. a = object distance. b = image distance. I need help please.
The lens formular =[tex]\frac{1}{f}=\frac{1}{a}+\frac{1}{b}[/tex]
How do I do that?
« Last Edit: 17/07/2014 04:56:12 by Chikis »