The focal length of the converging lens is 25 cm, which is equal to the optical power of this lens.
| September 27, 2021 | education
Let’s translate the focal length, expressed in centimeters, into meters:
25 cm = 0.25 m.
In order to solve the presented problem
Let us write down the formula relating the optical power of the lens and the focal length of the lens.
It contains only 1 value – the focal length:
D = 1 / F.
Substitute the known value of the focal length of the collecting lens into the written formula and get:
D = 1 / F = 1 / 0.25 m = 4 diopters (diopters).
Answer: 4 diopters.
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