A person with a myopic eye cannot see objects beyond distinctly. What should be the type of corrective lens used to restore proper vision?
Step 1. Formula to find the power of lens
In a normal eye, the distant point is infinity. The lens used should be such that an object at infinity, forms a virtual image at .
Formula to find the power of lens is,
Here, is the power of the lens and is the focal length.
We know that the relation,
Here, is the image distance and is the object distance.
Step 2. Calculate the power of the corrective lens used to restore proper vision.
It is given that, a person can't see objects beyond directly.
So, in order to view the distances beyond , from the given,
Put the values in the above relation, we get,
Put the value of focal length in the power of lens formula, we get,
So, the person suffers from Myopia, the corrective lens will be concave or diverging lens.
Hence, the power is should be used to restore proper vision.