Humans are able to see a small portion of the electromagnetic spectrum with their eyes. This portion is commonly referred to as the visible light spectrum. The visible light spectrum spans wavelengths from approximately 400 to 700 nanometers (nm). In terms of frequency, this corresponds to a range of approximately 430 to 790 terahertz (THz).

To calculate the percentage of the entire electromagnetic spectrum that humans can see, we can compare the range of visible light to the entire range of the electromagnetic spectrum. The electromagnetic spectrum encompasses a broad range of wavelengths and frequencies, including radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.

The entire electromagnetic spectrum is virtually infinite in range, extending from extremely long wavelengths (such as radio waves) to extremely short wavelengths (such as gamma rays). Given this vast range, the visible light spectrum constitutes only a small portion.

If we were to express the entire electromagnetic spectrum as a line, the visible light spectrum would represent a very small segment of that line. It is challenging to provide an exact percentage since the electromagnetic spectrum is continuous and infinite, but in relative terms, the visible light spectrum constitutes less than 1% of the full electromagnetic spectrum.

It’s worth noting that some individuals may have variations in their perception of the visible light spectrum due to factors like color blindness or other visual impairments.