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Question

The near point of a long-sighted person is 50 cm from the eye. The near point of a long-sighted person is 50 cm from the eye.
(a) Can she see clearly an object at:
(i) a distance of 20 cm ?
(ii) at infinity ?
(b) To read a book held at a distance of 25 cm, will she need converging or diverging spectacle lenses ?

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Solution

(a)(i) Since she is a long-sighted person with near point 50cm, she can only see objects at and beyond 50cm. So she can't see clearly the object kept at 20cm.
(a)(ii) she can see the object beyond 50cm, hence yes she can see the object at infinity.
(b) To allow the object at 25cm to converge on to her retina, she should use Converging spectacles.

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