Question

A person uses a lens of power-2.0d for correcting his distant vision.for correcting his near vision he uses a lens of power+1.5d . What is the focal length of the lenses required to correct this disorder

Answer 1

Hey buddy....
For the first one
P= 1/ f
f= 1/ P
= 1/ -2.0 = -0.5m × 100
= -50 cm
This is a concave lens..

For the second one
P= 1/ f
f= 1/ P
= 1/ 1.5
= 10/ 15 = 2× 100/ 3
= 66.66 cm = 66.67 cm
This is a convex lens..

Hope this helps you..
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