Question

The power of lens is + 2.0 D, then its focal length is

Answer 1

P= 1/f (with f in metres)
P =100/f (with f in cm)
2= 100/f
f=100/2
f= 50 cm


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Answer 2

Hey there !

Power = 1 / Focal Length ( in Meters )

Given Power = + 2 D

Focal Length = ?

Substituting in the formula we get,

+ 2 D = 1 / f

=> f = 1 / 2 or 0.5 m

Hence the focal length is 0.5 m or 50 cm.

Hope my answer helped !