Question

calculate the focal length of a lens if its power is -2.5 diopter​

Answer 1

Explanation:

hope this will help you

Answer 2

The focal length of the lens is (-40 cm).

Explanation:

Given that,

Power of the lens, P = -2.5 D

We need to find the focal length of a lens. We know that the reciprocal of the power is called focal length of the lens. It is given by the formula as:

$f=\dfrac{1}{P}\\\\f=\dfrac{1}{-2.5}\\\\f=-0.4\ m\\\\f=-40\ cm$

So, the focal length of the lens is (-40 cm). Hence, this is the required solution.

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Power of a lens

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