A man cannot see closer than 1m from the eyes clearly. What is the power of the corrective lensused?
Question
A man cannot see closer than 1m from the eyes clearly. What is the power of the corrective lensused?
Solution
The power of a lens is given by the formula:
P = 1/f
Where: P is the power of the lens in diopters f is the focal length of the lens in meters
In this case, the man cannot see clearly closer than 1m from his eyes. This means that the focal length of the corrective lens used should be 1m.
Substituting the given value into the formula, we get:
P = 1/1 P = 1 diopter
Therefore, the power of the corrective lens used is 1 diopter.
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