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Mathematics 8 Online
OpenStudy (sasogeek):

is there a statement definition for "power of a lens"?

OpenStudy (sasogeek):

I know the difinition being the inverse of the focal length but what does it mean?

OpenStudy (unklerhaukus):

the focal length a parabola makes a line with all points on it, the same distance from the foccus and the dotted line below ( called the directrix ) |dw:1317907115394:dw|

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