focal length

mollykins | 18:45 Wed 17th Mar 2010 | Science

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im doing some revision about lenses and here's something i don't quite understand.

if you're given the focal length of an object, say 40cm and you know that focal length equal 1/power how would you work out the power because you would do 1 x 0.4 (for metres) but that jsut equals 0.4 and that can't be right can it?

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silly me, i just realised that it would be 1/0.4. sorry abers.

Question Author

but what would be the units? watts?

Vagrant

diopters

Question Author

oh yeah, that was on the next page, thanks.

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