Humans possess an extraordinary capacity to analyze electromagnetic signals, and this achievement fundamentally rests upon the fact that light is nothing other than an electromagnetic wave.

Light: A Window to the Spectrum

Visible light, perceived by our eyes, represents only an infinitesimal fraction of the vast electromagnetic spectrum. This spectrum includes, among others, radio waves, microwaves, infrared, ultraviolet, X-rays, and gamma rays. Our eye is a sensory organ of remarkable sophistication, capable of capturing photons (the particles of light) and converting them into nerve signals.

From Light to Electromagnetic Signal

This process of vision is, in essence, an electromagnetic signal analysis.

Objects around us emit, reflect, or transmit light waves (electromagnetic waves).
These waves enter the eye and reach the retina.
The photoreceptors (rods and cones) absorb the energy of these waves, triggering a chemical reaction that generates an electrical signal (nerve impulse).
This signal is then transmitted to the brain via the optic nerve, where it is interpreted as an image, complete with colors, shapes, and movements.

An Unconscious and Constant Analysis

Thus, every time we look at the world, we are performing a complex and continuous analysis of an electromagnetic signal. Our ability to distinguish colors (different wavelengths), assess distances, or track movement is tangible proof that humans are biologically equipped to analyze a vital portion of the electromagnetic spectrum: light. This constant interaction with electromagnetic waves is essential not only for our perception of the world but also for knowledge acquisition and survival.