Question

A __________ lens is used to correct myopia and a _________ lens is used to correct hypermetropia.
A) Concave, concave
B) Convex, convex
C) Convex, concave
D) Concave, convex

Answer 1

Hint: A lens is an optical device that disperses a light beam using refraction. There are two types of lenses namely concave lens and convex lens. A simple lens consists of a single piece while a compound lens consists of several lenses.

Complete answer:
Myopia is also called nearsightedness. It indicates the inability to see the distant objects clearly and the close objects are visible clearly. It produces a blurry image as the eye converges the rays from a distant object in front of the retina and when they strike the retina they become divergent. Headache and eye strain are common symptoms. This can be corrected by using a concave lens and it is placed in front of the myopic eye.
Hypermetropia is also called longsightedness. It indicates the inability to see the nearby objects clearly and the distant objects are visible clearly. In this, the nearby objects are focused at a location behind the retina. This can be corrected by using a convex lens. If the power to focus is too weak and if the eye is too short, the image will go to the wrong place.
If farsighted, then wearing the glasses at the time of reading or while working on the computer is sufficient.
Thus the concave lens is used to correct myopia and the convex lens is used to correct hypermetropia.

Hence the correct option is D.

Note: 1. Hypermetropia is a hereditary condition. The symptoms of hypermetropia are blurry vision at night, eyestrain, headaches, and mostly trouble with reading.
2. After the age of 40 years, almost everyone experiences some degree of presbyopia.