Which of these is an example of electronic aid?

Options

A. Bifocal lens
B. Telescope
C. Contact lens
D. Talking watches

Answer

To determine which of the given options is an example of an electronic aid, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are Bifocal Lenses, Telescope, Contact Lenses, and Talking Watches.

2. **Analyze Bifocal Lenses**:
- Bifocal lenses are spectacles that have two different optical powers. They are used to correct vision for people with presbyopia.
- **Conclusion**: Bifocal lenses do not require electricity to function; they operate based on the refraction of light. Therefore, they are **not** an electronic aid.

3. **Analyze Telescope**:
- A telescope uses lenses to magnify distant objects. It typically consists of two convex lenses.
- **Conclusion**: Like bifocal lenses, telescopes do not require electricity to operate; they rely on optical principles. Thus, telescopes are **not** electronic aids.

4. **Analyze Contact Lenses**:
- Contact lenses are thin lenses placed directly on the surface of the eye to correct vision.
- **Conclusion**: Contact lenses are also non-electronic devices as they do not require any electrical components to function. Therefore, they are **not** electronic aids.

5. **Analyze Talking Watches**:
- Talking watches are designed to announce the time audibly. They contain electronic components such as a speaker and require a power source (like a battery) to function.
- **Conclusion**: Since talking watches utilize electronic components to operate, they are indeed classified as electronic aids.

6. **Final Answer**: The example of an electronic aid from the given options is **Talking Watches**.