Polaroids are used

Options

A. A. to eliminate head light glare in automobile
B. B. in production of 3-D motion pictures
C. C. in sun glasses
D. D. all the above

Answer

**Step-by-Step Solution:**

1. **Understanding Polaroids:**
- A Polaroid is a material that polarizes light. Polarization refers to the process of restricting the vibrations of light waves to a particular plane.

2. **Identifying Uses of Polaroids:**
- **Use 1:** Polaroids are commonly used in sunglasses to reduce glare from reflective surfaces, such as water or roads.
- **Use 2:** They are also used in car headlights to minimize glare, improving visibility for both the driver and oncoming traffic.
- **Use 3:** In art, Polaroids can enhance color contrast in old oil paintings, making the colors appear more vibrant and distinct.
- **Use 4:** Polaroids are utilized in 3D motion pictures, where they help create the illusion of depth by filtering light in specific ways.
- **Use 5:** Lastly, Polaroids are used to make Polaroid seats, which are designed to provide comfort and support.

3. **Evaluating the Options:**
- After identifying the uses, we can review the provided options (A, B, C, D) to determine which ones are correct.
- Since we have identified multiple uses of Polaroids, we can conclude that options A, B, and C are all correct.

4. **Final Conclusion:**
- Therefore, the correct answer is option D, which states that all the above uses of Polaroids are correct.