Question

The defect hypermetropia can be corrected by using a _________
A.) Convex lens
B.) Concave lens
C.) Concave mirror
D.) Convex mirror

Answer 1

Hint: In order to deal with this question first we will understand hypermetropia and also the causes of hypermetropia then we will proceed further by discussing the lens that can be used for the correction of hypermetropia amongst the given options.

Complete step-by-step answer:

Hypermetropia:
It is called long sightedness In hypermetropia, people are able to see objects far apart but are unable to see objects nearby. Picture of artifacts nearby is created behind the person's retina. Close-by shifts beyond 25 cm.

Cause of hypermetropia:

A. Eyeball becomes too small.
B. Focal length of eye lens is too long
C. Corrections of hypermetropia:
D. It can be adjusted with a convex lens of appropriate power.
E. It helps to form an image on the retina.

Hence, the defect hypermetropia can be corrected by using a convex lens
So, the correct answer is option A.)

Additional information-
Most lenses are circular lenses: their two sides are parts of spherical surfaces. the surface may be convex (bubbling from the lens outward), concave (depressed into the lens), or planar (flat). The line between the spheres centers which make up the surfaces of the lens is called the lens axis. The lens axis usually travels through the actual center of the lens due to the production process. After manufacturing, the lenses can be cut or ground to give them a different shape or dimension. And the lens axis may not cross the lens' physical centre.

Note- Mirror cannot be used to correct the power of eyesight of a person. So mirrors are never used in the spectacles. Other uses of convex lens are: A convex lens is employed in microscopes and magnifying glasses to converge all incoming light rays to a particular point. The convex lens is also used in cameras.