Question

The power of the lens is +20D. Find the focal length of the lens .Name the kind of this lens

Answer 1

the lens is convex lens
the focal length is 0.05m
......hope it helps

Answer 2

Focal length of the lens, f = +5 cm and its a convex lens.

Explanation:

Given that,

Power of the lens, P = +20 D

To find,

Focal length of the lens.

Solution,

The power of a lens is given by the inverse of its power. It is given by :

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

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

$f=\dfrac{1}{20}$

f = +0.05 m

or

f = +5 cm

The focal length of convex lens is positive. So, it is a convex lens.

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Power of a lens

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