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Which of the two has a greater power : a lens of short focal length or a lens of large focal length?
A lens with a shorter focal length will have greater power than a lens with a large focal length because power varies inversely with the focal length.
Explanation
We know that the power of the lens is inversely proportional to the focal length of the lens. Hence, the lens with a shorter focal length will have more power or higher refraction (causes more bending of light rays). While the lens with a longer focal length will have less power or low refraction (causes less bending of light rays).
Thus, a lens of short focal length will have greater power, which means it causes more bending (or more refraction) of light rays passing through it.
Updated on: 10-Oct-2022
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