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2 stepshere's the solution to your physics problem:
The power of a lens is the reciprocal of its focal length in meters.
Formula: Power (P) = 1 / focal length (f)
Given:
Focal length (f) = 20 cm
Convert the focal length from centimeters to meters.
f = 20 cm = 20 / 100 m = 0.20 m
Calculate the power of the lens using the formula.
P = 1 / f
P = 1 / 0.20 m
P = 5.0 DThe power of the lens is 5.0 Diopters (D).
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