Question

What is mean by Focal length.When it has less power and when it has more power ?​

Answer 1

Explanation:

focal length is the length from the pole to the focus.

p = 1/f

hence, there is more power of there is small focal length

Answer 2

The focal length is length from pole to focus .

relationship :P=1/f

The power of a lens is defined as the reciprocal of its focal length in meters, or D = 1/f, where D is the power in diopters and f is the focal length in meters. Lens surface power can be found with the index of refraction and radius of curvature..

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