* What we "see" is light interacting with our eyes. Our eyes have specialized cells called photoreceptor cells that are sensitive to light. These cells convert light energy into electrical signals that our brains interpret as vision.
* Light waves are too small to see directly. The wavelengths of visible light are on the order of nanometers (billionths of a meter). This is far too small to be resolved by our eyes or even most microscopes.
* Electromagnetic radiation is a spectrum. Visible light is just a small portion of the entire electromagnetic spectrum, which includes radio waves, microwaves, infrared, ultraviolet, X-rays, and gamma rays. We can't see most of these other forms of radiation because they don't interact with our eyes in the same way as visible light.
So, why do we talk about light "waves" and "rays"?
* Waves: The wave nature of light helps explain its behavior, like diffraction and interference. These phenomena are difficult to explain without considering light's wave-like properties.
* Rays: The concept of light rays simplifies understanding how light travels in straight lines (unless it's being reflected or refracted). This is useful for things like optics and ray tracing.
In short: We don't directly see light waves or electromagnetic rays. What we perceive as "light" is actually our brain's interpretation of the electrical signals generated by our eyes when they interact with visible light.
