A person can not see at the distance of 1 m. Calculate the power of the lens that he should use to read a book at a distance of 25 cm.
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it means the person is suffering from myopia so he/she must use be cured by fusing concave lens .
power =1/f
so p=1/.25
so, p=4 diopter
hope this helps u
power =1/f
so p=1/.25
so, p=4 diopter
hope this helps u
hema74:
Wrong .....
Focal length is 25cm =0.25m
So the answer is 4D
ya u r ri8 i m so sorry
i m in a hurry during answering this
now see the answeer is it ri8
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