Question

what is the focal length of a lens whose power is + 1.5 d

Answer 1

focal length is 100/p(d) cm or 1/p(d) m i.e.66.67 cm or 0.67 m

Answer 2

Focal length = 1 / Power
= 1 / (1.5 D)
= 1 / [3/2 D]
= 2/3 m
= 0.667 m
= 66.7 cm