A man can see the objects up to a distance of one metre from his eyes. To see objects at infinity, he needs a lens of focal length
A
0.5 D
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B
+1.0 D
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C
+2.0 D
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D
–1.0 D
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Solution
The correct option is D –1.0 D For correcting the myopic eye, the concave corrective lens should form the image for an object at infinity at the far point of the defective eye.
Applying sign convention, f = –(far point of myopic eye) = – 100 cm. So power of the lens P=100f=100−100=−1D