What is a fundamental property of all light rays?

Light rays are fundamentally described as electromagnetic waves. This concept stems from the understanding that light behaves as both a particle and a wave, known as the wave-particle duality of light. The electromagnetic nature of light encompasses a spectrum of waves, including visible light, infrared, ultraviolet, and other forms of electromagnetic radiation.

Understanding light as electromagnetic waves is crucial for various applications in optics, including lens design, vision correction, and understanding how light interacts with different materials. This property allows us to explore important aspects such as refraction, reflection, and dispersion, which are central to optics and the functioning of optical devices.

In contrast, the other options do not accurately describe the fundamental nature of light. For instance, "They are static" implies immobility, which contradicts the essential property of light being dynamic and capable of traveling through space. The notion that "They can't vary in speed" misrepresents the fact that while light is consistent in speed in a vacuum, it can change speed when it enters different mediums, such as water or glass. Lastly, stating that "They travel at half the speed of sound" is misleading, as light travels much faster than sound, approximately 299,792 kilometers per second in a vacuum, while