Final answer:
Ultraviolet and infrared are types of light that cannot be seen by humans, as they fall outside the visible spectrum with wavelengths below 380 nm and above 740 nm respectively.
Step-by-step explanation:
The light that cannot be seen by the human eye among the options listed is ultraviolet radiation (UV). The visible spectrum includes light with wavelengths generally ranging from 380 to 740 nm, which is the portion of the electromagnetic spectrum detected by the human eye. Light with wavelengths shorter than the visible spectrum, specifically below 380 nm, falls under ultraviolet radiation. Similarly, light with a wavelength greater than 740 nm is considered infrared radiation, which is also invisible to the human eye but can be detected as heat. Thus, both ultraviolet and infrared are types of light that are not visible to humans, while visible light is, by definition, the type of light we can see.