Cell membrane is visible under

Options

A. Electron microscope
B. Optical microscope
C. Both optical and electron microscope
D. Oil immersion lens

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks under which type of microscope the cell membrane is visible. We need to evaluate the options provided.

2. **Identifying the Types of Microscopes**: The options given are:
- A) Electron microscope
- B) Optical microscope
- C) Both optical and electron microscope
- D) Oil immersion lens

3. **Analyzing the Optical Microscope**:
- The optical microscope, also known as a light microscope, uses visible light and lenses to magnify images of small objects.
- However, many cell organelles, including the cell membrane, are not clearly visible under an optical microscope because their size is close to the limit of resolution of this type of microscope.

4. **Analyzing the Electron Microscope**:
- The electron microscope uses electrons to illuminate specimens, which allows for much greater resolution compared to optical microscopes.
- This higher resolution enables the visualization of smaller structures, including cell organelles like the cell membrane, mitochondria, and nucleus.

5. **Conclusion**: Based on the analysis, the cell membrane is clearly visible under an electron microscope due to its superior resolution capabilities. Therefore, the correct answer is:
- **A) Electron microscope**.

---