The focal length of the lens is 5 cm. What is the optical power of the lens? What kind of lens is it – collecting or diffusing?
| January 12, 2021 | education
The focal length of the lens is 5 cm. What is the optical power of the lens? What kind of lens is it – collecting or diffusing?
F = 5 cm = 0.05 m.
D -?
The optical power of a lens D is called the value inversely proportional to its focal length F: D = 1 / F.
D = 1 / 0.05 m = 20 diopters.
Since D> 0, this is a convex or converging lens ..
Answer: the optical power of the collecting lens is D = 20 diopters.
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