For the myopic eye with far point 1.2 m, what is the approximate focal length of the required concave lens?
Question
For the myopic eye with far point 1.2 m, what is the approximate focal length of the required concave lens?
+1.2 m
-1.2 m
-0.25 m
+0.25 m
Answer
-1.2 m
Detailed Explanation
To correct myopia, a concave lens with focal length equal to the negative of the far point distance is needed: f = -1.2 m, since an object at infinity should form its image at the person's far point.