A person who can see object clearly at a distance of 10cm,requries spectacles to be able to see clearly objects at a distance of 30cm.What type of spectacle should he use? Find the focal length of the lens.
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That person is suffering from a disease called Myopia. He requires a concave lens with appropriate focal length.
we know that :
P=100/f ; if f is in cm's.
P=100/-30
= -3.3d.
we know that :
P=100/f ; if f is in cm's.
P=100/-30
= -3.3d.
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