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The same person needs a lens of power +1.5 dioptres for correcting near vision. What is the approximate focal length of this lens?

Question
The same person needs a lens of power +1.5 dioptres for correcting near vision. What is the approximate focal length of this lens?
-0.67 m
+0.67 m
+1.5 m
-1.5 m
Answer
+0.67 m
Detailed Explanation
f = 1/P = 1/1.5 » +0.67 m (about 67 cm), a convex lens for hypermetropia/near-vision correction.
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