The optical power of the lens is D = 4 diopters. What is the focal length of this lens. What kind of lens it is.
| December 21, 2020 | education
D = 1 / F
Where D is the optical power
A F – focal length
Hence,
F = 1 / D
F = 1 / 4m = 25cm
The focal length of such a lens is 25 cm.
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