Class 10 > Science

Question

A person can see upto a distance of 0.5 m. To correct his defect of vision so that he could see upto infinite distane, which type of lens and of what power he has to use in his spectacles?
Medium

Solution

u=0.5m=50cm, v=25cm. To find f, we know that 1/v-1/u=1/f; 1/50-1/25=1/f; 1/f=-1/50; f=50cm. Hence a concave lens of focal length 50cm is used.

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