The optical power of the lens is D = 4 diopters. what is the focal length of this lens? what kind of lens is it?
| December 7, 2020 | education
Because the optical power of the lens is positive, then the lens is converging. D = 1 / F => F = 1 / D = 1/4 diopters = 0.25 m = 25 cm
Answer: a collecting lens with a focal length of 25 cm.
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