Why is the optical power of a diffusing lens considered negative?
| July 7, 2021 | education
The power of a diverging lens is considered negative because the power of a lens is inversely proportional to the focal length of that lens. With a converging lens, the focal length is in front, hence the optical power of the lens is considered positive. With a diffusing lens, the focal length is at the back, so the optical power is considered negative.
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