Question

The lens used to correct myopia is:

• A. Convex lens
• B. Biconcave lens
• C. Bifocal lens
• D. Cylindrical lens

Hint:

Biconcave lenses are used for myopia because they spread out light rays before they enter the eye.

Answer 1

The Correct Option is B

1. Understanding myopia (nearsightedness):
Myopia is a condition where a person can see nearby objects clearly, but distant objects appear blurred. This occurs because the light entering the eye focuses in front of the retina rather than directly on it. 2. Correcting myopia with a biconcave lens:
A biconcave lens, which is a type of concave lens with two inward-curved surfaces, diverges light rays before they enter the eye, effectively increasing the focal length. This helps to focus the light on the retina rather than in front of it, thus correcting the blurred vision for distant objects. 3. Other lenses:
Convex lens: Used for hyperopia (farsightedness), where the light focuses behind the retina.
Bifocal lens: Used for both near and far vision, typically in cases of presbyopia.
Cylindrical lens: Used to correct astigmatism, not myopia.