Data: Power of a lens = + 2D
To find: Its focal length. (f)
Solution: P = 1 / f(m)
Where: P = Power and f = Focal length of lens in metre)
Therefore, f = 1/P
Therefore, f = + (1/2) metre
Therefore, f = + 0.5 metre.
Ans. The focal length of the given lens is + 50 cm.
