A thin converging lens has focal length f = 0.25 m. What is its optical power P in diopters?

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Multiple Choice

A thin converging lens has focal length f = 0.25 m. What is its optical power P in diopters?

Explanation:
Power in diopters is the reciprocal of the focal length in meters: P = 1/f. With a focal length of 0.25 m, the power is P = 1 / 0.25 = 4 diopters. A converging lens has a positive focal length, so its power is positive as well. Shorter focal lengths mean higher power, so a focal length of 0.25 m giving 4 D fits neatly: 0.5 m would be 2 D, 0.025 m would be 40 D, and 0.25 m yields 4 D.

Power in diopters is the reciprocal of the focal length in meters: P = 1/f. With a focal length of 0.25 m, the power is P = 1 / 0.25 = 4 diopters. A converging lens has a positive focal length, so its power is positive as well. Shorter focal lengths mean higher power, so a focal length of 0.25 m giving 4 D fits neatly: 0.5 m would be 2 D, 0.025 m would be 40 D, and 0.25 m yields 4 D.

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