Question

What is the power of a convex lens having focal lengh 0.5?

Answer 1

Answer:

The algebraic sign of the magnifying power indicates whether the lens causes an incident pencil of parallel light rays to converge or to diverge. Thus, a diverging lens having a focal length of 1 m has a power of -1 diopter, and a converging lens of focal length 0.5 m has a power of two diopters.

f=0.5 m

P=1/f=1/0.5=+2D

Explanation:

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