Question

If a lens has a power of -14.50, what is the focal length in mm?

Answer 1

Answer:

Focal length of the lens, f = - 68 mm

Explanation:

Given that,

Power of a lens, P = -14.50 D

We need to find the focal length of the lens. We know that the focal length and the power of lens has inverse relationship. Mathematically, it is given by :

$f=\dfrac{1}{P}$

f is the focal length of the lens

$f=\dfrac{1}{-14.50}$

f = -0.068 m

or

f = -68 mm

So, the focal length of the lens is (-68 mm). Hence, this is the required solution.