Question

If power of a lens is -0.25 then its focal length is

Answer 1

Answer:

P=1/f

p=1/-0.25

p=-100/25

p=-4

Explanation:

plz mark as brainlist answere

Answer 2

Given:

The power of a lens is -0.25

To find:

The focal length of the lens

Solution:

The focal length of the lens is 4m.

We can find the length by following the given process-

Let the focal length of the lens be f.

We know that the power of a lens is the reciprocal of its focal length.

The  power of the lens, P= -0.25

So, the power of the lens=1/Focal length of the lens

P=1/f

So, f=1/P

On putting the value, we get

f=1/-0.25

=-100/25

=-4

So, the focal length is 4m.

Therefore, the focal length of the lens is 4m.