If a person wears lens of power -6D for distant vision and for correcting his near vision he needs a lens of+2D.Determine the focal length of the lenses in both the case
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power = 100\f
so,
(1) -0.6=100\f
f=-1.6 m
that is convex lens
(2) 2 =100\f
f=1\2 m
that is concave lens
so,
(1) -0.6=100\f
f=-1.6 m
that is convex lens
(2) 2 =100\f
f=1\2 m
that is concave lens
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