Question

When a person is suffering from both Myopia and Hypermetropia, which should be used ?

• A. Bi-convex lens
• B. Bi-concave lens
• C. Bi-focal lens
• D. Bi-focal mirror

Answer 1

The Correct Option is C

To solve this question, we need to determine the correct optical aid for a person suffering from both Myopia (nearsightedness) and Hypermetropia (farsightedness).

1. Understanding the Conditions:
- Myopia: Corrected using concave lenses.
- Hypermetropia: Corrected using convex lenses.

2. When Both Conditions Are Present:
A person with both conditions needs correction for both near and distant vision. This is achieved using a bi-focal lens, which has two parts: - The upper part corrects distant vision (myopia). - The lower part corrects near vision (hypermetropia).

3. Analyzing the Options:
- Bi-convex lens: Only for hypermetropia.
- Bi-concave lens: Only for myopia.
- Bi-focal lens: Corrects both.
- Bi-focal mirror: Not used for vision correction.

Final Answer:
Option (C) Bi-focal lens is correct.