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Arts & Literature3 mins ago
focal length
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?
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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