Question

Myopia can be corrected using _____________ lens.

Answer 1

Hint :
The human eye is a natural optical device. The light enters through a central hole called the pupil in the iris of the eye. The eye lens focuses the light on the retina. The retina transmits the electrical signals to the brain through the optic nerves. Any damage in any of these parts can disrupt the vision.

Complete step by step answer
Myopia is an important eye defect. It is also called nearsightedness or short sight. In the case of myopia, the light from a distant object is converged by the eye at a point in front of the retina. That means the eye lens produces too much convergence for the incident light beam.
This defect is corrected using a concave lens.The answer is: concave lens.

Additional Information
Depending upon the distance of the object from the eye, the muscles of the eye adjusts the focal length of the lens so that the image is focused on the retina. This property of the eye is called accommodation. Accommodation will not be proper for elderly people. This defect is called presbyopia. If the eye lens focuses the light at a point behind the retina, the image will not be clear. This defect of the eye is called hypermetropia or farsightedness (long sight). It can be corrected using a convex lens.

Note
Concave lenses are diverging lenses. Myopia occurs because of too much convergence of the incident light. The concave lens placed in front of the eye will diverge the light so that the image will be focused on the retina.