Question

A doctor has prescribed a corrdective lens of +1.5D FIND THE FOCAL LENGTH OF THE LENS

Answer 1

1/1.5m or 100/1.5 cm

solve TO get

answer as 66.667cm or 0.667m

Answer 2

hey dear your Ans is

f=1/P where

P =Power of the lens

and f=focal length of lens

then, P=1.5 D

f=1/1.5 =10/15 = 2/3 =0.66

f=0.66 meter