Question

Which lens is used to correct Myopia?

• A. Concave
• B. Convex
• C. Cylindrical
• D. None of these

Hint:

Myopia (short-sightedness) is corrected using a concave lens because it diverges light rays and helps focus the image on the retina.

Answer 1

The Correct Option is A

Concept:
Myopia is also called short-sightedness or near-sightedness. A person suffering from myopia can see nearby objects clearly but cannot see distant objects clearly. In a myopic eye, the image of distant objects forms in front of the retina instead of on the retina. To correct this defect, a concave lens is used.

Step 1: Understanding why myopia occurs.
In myopia:
• The eyeball may become elongated, or
• The eye lens may have excessive converging power. Due to this, parallel rays coming from distant objects focus before reaching the retina. Hence, distant objects appear blurred.

Step 2: Understanding the role of concave lens.
A concave lens diverges the incoming light rays slightly before they enter the eye. This divergence helps the eye lens focus the image exactly on the retina. Therefore, myopia is corrected using a concave lens. \[ \boxed{\text{Myopia correction} = \text{Concave lens}} \]

Step 3: Checking other options.

• Convex lens is used for hypermetropia.
• Cylindrical lens is used for astigmatism.
• Therefore, the remaining options are incorrect. Hence, the correct answer is: \[ \boxed{(1)\ \text{Concave}} \]