Question

Find the power of a convex lens of focal length 0.20m.​

Answer 1

Answer:

Given f1=0.20m,f2=0.30m. ∴f=0.12m. Power of the first lens P1=1f1=10.20=5D. Power of the second lens P2=1f2=10.30=3.333D.

Answer 2

Answer:

see as it is a convex lens so its power would be positive now

focal length = 0.20

power=1/0.20

so 100/20

so power =+5.0 dioptere