Question

Myopia is corrected by using :

• A. Concave lens
• B. Convex lens
• C. Cylindrical lens
• D. Any lens

Hint:

Myopia (nearsightedness) causes light to focus in front of the retina. To push the focal point back onto the retina, a diverging lens is needed. Concave lenses are diverging lenses, making them the correct choice for myopia correction.

Answer 1

The Correct Option is A

Step 1: Understand what Myopia is.
Myopia, also known as nearsightedness, is a common vision condition where a person can see close objects clearly, but objects farther away appear blurry.
In a myopic eye, the eyeball is either too long, or the cornea is too steeply curved. This causes light rays from distant objects to focus in front of the retina, instead of directly on the retina. Step 2: Determine the type of lens needed to correct Myopia.
To correct myopia, the light rays from distant objects need to be diverged slightly before they enter the eye, so that they can then focus directly on the retina.
A diverging lens is required for this purpose. Step 3: Identify which type of lens is a diverging lens.

Concave lens: A concave lens is a diverging lens. It is thinner in the middle and thicker at the edges. It causes parallel rays of light to diverge (spread out) after passing through it.
Convex lens: A convex lens is a converging lens. It is thicker in the middle and thinner at the edges. It causes parallel rays of light to converge (come together) after passing through it. Convex lenses are used to correct hypermetropia (farsightedness).
Cylindrical lens: A cylindrical lens is used to correct astigmatism, a condition where the eye's cornea or lens has an irregular curvature.
Any lens: This is incorrect, as the specific type of vision defect requires a specific type of corrective lens. Step 4: Conclude the correct corrective lens.
Since a concave lens is a diverging lens and is used to spread out light rays before they enter the myopic eye, it is used to correct myopia. Step 5: Compare with the given options.
The correct option is (1) Concave lens. (1) Concave lens