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Answer to Question #14169 in Optics for thabitha

Question #14169
the power of a lens is +2.0 D. Find its focal length and state what kind of lens it is.
Expert's answer
D = +2.0 D, D = 1 / f.
Focal length f = 1 / D = 1 / 2.0 = 0.5 m
As D >
0, this is positive (or converging) lens.

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