Question

Which lens is used in nearsightedness (myopia)?

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

Hint:

Remember: Concave lens → Myopia, Convex lens → Hypermetropia, Cylindrical lens → Astigmatism.

Answer 1

The Correct Option is C

Step 1: Understanding Myopia (Nearsightedness):
Myopia is an eye defect in which a person can see nearby objects clearly but distant objects appear blurred. This happens because the image is formed in front of the retina instead of on it. Step 2: Cause:
Eyeball becomes elongated, or
Lens becomes too curved, causing excessive convergence.
Step 3: Correction:
To fix myopia, we use a concave lens (diverging lens).
It diverges incoming rays before they enter the eye, so that the final image shifts backward onto the retina.
Step 4: Other Lenses:
Convex lens → Used in hypermetropia (farsightedness).
Cylindrical lens → Used in astigmatism.
Step 5: Final Answer:
Myopia is corrected using a Concave lens.