Power of a lens having focal length 10 cm is :

Foundation

Physics Foundation

refraction from lens

Question

+5D.

+0.5D.

+10D.

–5D.

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The power of a lens (P) is defined as the reciprocal of its focal length (f) in meters. The formula is:

$P = \frac{1}{f}$

First, convert the focal length from centimeters to meters. 10 cm = 0.1 m.

Substitute into the formula: $P = \frac{1}{0.1} = 10$ D.

A positive focal length indicates a converging lens, so the power is positive. The power is +10D.

Final Answer: +10D