Question

if the focal length of lens is 2 meters then what is its power​

Answer 1

Answer:

p=1/f

Explanation:

p=1/2(both 1 and 2 are in metre)

so,p=0.5 dioptre

Answer 2

The power of the lens is 0.5 D.

• Given data :

The focal length of the lens is 2 metres.

(Now,we don't need to convert the unit because the given measurements because those are already in SI units.)

• Now, we have to calculate the power of the lens by using the following mathematical formula :

Power of lens = 1/focal length of the lens

•Now,by putting the given values,we get -

Power of the lens

= 1/2

= 0.5 D

[Here,the D is dioptres which is the SI unit of power of a lens]

So,the power of the lens is 0.5 D (Answer).