The focal length of the lens is 20 cm. What is its optical lens.

univerkov | December 19, 2020 | education

Given:
F = 20cm
Find: D =?
Decision:
F = 20cm = 0.2m (conversion to SI units)
D = 1 / F
D = 1 / 0.2 = 5 diopters
Answer: the optical power of the lens D = 5 diopters

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