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The far point of a myopic person is 80 cm in front of the eye. What is the focal length of the corrective lens required?

Question
The far point of a myopic person is 80 cm in front of the eye. What is the focal length of the corrective lens required?
f = +0.8 m
f = -0.8 m
f = -0.25 m
f = +1.25 m
Answer
f = -0.8 m
Detailed Explanation
For myopia correction, f equals the negative of the far point distance: f = -0.80 m, using a concave lens.
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