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OpenStudy (sasogeek):
is there a statement definition for "power of a lens"?
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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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