The focal length of a lens is +150 mm. What kind of lens is it and what is its power?

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Solution

The focal length of a lens is +150 mm and so the lens is a converging lens or a convex lens.
f = 150 mm = 0.15m

Power, $P = \frac{1}{f (i n m)} = \frac{1}{0.15} = 6.67 D$

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