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Question
The far point of a myopic person is 40 cm. To see the distant objects clearly, the focal length and the power of the lens used should be:
The far point of a myopic person is 40 cm. To see the distant objects clearly, the focal length and the power of the lens used should be:
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Solution
The correct option is A -40 cm, -2.5 D
Focal length of lens to be used must be equal to distance of far point.
So f=−40cm
(As myopic person needs concave lens so f negative)
power of lens, p=1f in meter==−10.40=−2.5D
Focal length of lens to be used must be equal to distance of far point.
So f=−40cm
(As myopic person needs concave lens so f negative)
power of lens, p=1f in meter==−10.40=−2.5D
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