Question

If the focal length of a lens is 2m, what is the power of the lens​

Answer 1

Answer is - 0.5 Dioptre

Step-by-step explanation:

• The Power of lens, $P = \frac {1}{f}$(Power = Reciprocal of Focal length)

• Where f = Focal Length of Lens

• Focal Length of Concave lens, f = - 2 m

So, Power, $P = \frac {1}{- 2}$

• Then the Power of Lens, P = - 0.5 Dioptre

Where, the Dioptre is the unit of measure for the refractive power of a lens.

Answer 2

Step-by-step explanation:

p=f1 pis power of lens in dioptters