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A person needs a lens of power -5.5 dioptres for correcting distant vision. What is the approximate focal length of this lens?

Question
A person needs a lens of power -5.5 dioptres for correcting distant vision. What is the approximate focal length of this lens?
+0.18 m
-0.18 m
-5.5 m
+5.5 m
Answer
-0.18 m
Detailed Explanation
f = 1/P = 1/(-5.5) » -0.18 m (about -18 cm), a concave lens for myopia correction.
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