Find the power of a concave

Question.
Find the power of a concave lens of focal length 2 m.

solution:

Given, focal length $=-2 \mathrm{~m}$

(focal length of concave lens is negative).

Power, $P=\frac{1}{f}=\frac{1}{-2.0}$

or $P=-0.5$ Dioptre
NCERT solutions class 10 science chapter 10 Light-Reflection and Refraction

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