Question

find the focal length of a concave lens of power -1.0D what type of lens is this

Answer 1

The focal length of the lens is -100 cm.

Explanation:

Given that,

Power of the concave lens, P = -1 D

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

$f=\dfrac{1}{D}\\\\f=\dfrac{1}{-1}\\\\f=-1\ m\\\\f=-100\ cm$

So, the focal length of the lens is -100 cm.

Learn more,

Power of a lens

https://brainly.in/question/13652815

Answer 2

Answer:

-1m or -100cm

Explanation:

given that, power of a lens, P= -1.0Dioptre

As we knew that,

$p = \frac{1}{f} \\ = > - 1 = \frac{1}{f} \\ = > - 1f = 1 \\ = > f = \frac{ - 1}{1 } = - 1metre$

Threfore, focal length is 1m

Since. it's fical is negative

HENCE, IT IS A CONCAVE LENS

HOPE IT WILL HELP

KEEP QUESTIONING