What is the optical power of glasses with a convex lens if the focal length is 20 cm? What are these glasses for?
| November 26, 2020 | education
F – focal length of the lens
D – optical power
Given:
F = 20 cm (SI = 0.2 m)
Find: D
D = 1 / F = 1 / 0.2 = 5 diopters
Answer D = 5 diopters
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