Question

The focal length of a lens is.+25cm. what is its power?​

Answer 1

Answer:

The power of a lens (P) is inversely proportional to the focal length (f) and it is measured as the reciprocal of the lens's focal length. The focal length of a lens is usually measured in meters and the power of the lens is measured as Dioptre. A focal length of 1 meter gives 1 dioptre power of the lens.

Explanation:

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Answer 2

Answer:

Explanation:

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Power is defined as the reciprocal of focus or focal length. Then power = 1/f where f is in (metres)

here

f = 25cm

1m = 100cm

Then p = 1 / 25 (/100)

p = 100 / 25

p = 4D (diopter)