A person needs a lens of power -6.0dioptre for correcting his distant vision. For correcting his near vision, he needs a lens of power +2.0 dioptre. What is the focal length of the lens and its nature required for correcting (i)distant vision
(ii)Near vision
A concave lens is required for correcting distant vision.
The power of concave lens = -6 dioptre
Now, power of lens =
thus, focal length =
A convex lens is used to correct the near vision.
Power of convex lens = 2 dioptre
focal length =
The power of concave lens = -6 dioptre
Now, power of lens =
thus, focal length =
A convex lens is used to correct the near vision.
Power of convex lens = 2 dioptre
focal length =