Which of the following is employed to clearly view objects which cannot be seen directly due to obstruction?

Options

A. Laser
B. Periscope
C. Kaleidoscope
D. None of these

Answer

To solve the question "Which of the following is employed to clearly view objects which cannot be seen directly due to obstruction?", we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding the Question**:
- The question asks for a device that allows us to see objects that are obstructed from direct view.

2. **Evaluate the First Option: Laser**:
- A laser is a focused beam of light. While it can illuminate objects, it does not allow us to see around obstacles. Therefore, it is not suitable for viewing obstructed objects.
- **Conclusion**: Laser is not the correct answer.

3. **Evaluate the Second Option: Periscope**:
- A periscope is a device designed to allow viewing of objects that are not in the direct line of sight, typically using mirrors positioned at 45-degree angles.
- When you look into a periscope, light from the object reflects off the mirrors and reaches your eyes, allowing you to see over or around obstacles.
- **Conclusion**: Periscope is a suitable device for viewing obstructed objects.

4. **Evaluate the Third Option: Kaleidoscope**:
- A kaleidoscope is a toy that creates beautiful patterns by reflecting light through mirrors. However, it does not serve the purpose of viewing objects that are obstructed.
- **Conclusion**: Kaleidoscope is not the correct answer.

5. **Evaluate the Fourth Option: None of these**:
- Since we have identified that the periscope is a valid option for viewing obstructed objects, this option is not applicable.
- **Conclusion**: None of these is not the correct answer.

6. **Final Answer**:
- The correct answer is **Periscope**.