Documents Power (Diopters)focal length (metres) 1 D 1 m 2 D.5 m Convex lens (has a positive power e.g +1.5 D)....

Slide 1 Slide 2 www.ahaf.org Slide 3 Power (Diopters)focal length (metres) 1 D 1 m 2 D.5 m Convex lens (has a positive power e.g +1.5 D) focal point forms convergent light…