There are many things that we cannot see, yet we know they exist. One of the most common examples is ultraviolet light. We can’t see it with our eyes, but we know that there are wavelengths of light not visible to humans.
Ultraviolet waves
Ultraviolet waves have a shorter wavelength than visible light and higher frequency than infrared waves, meaning that they are more energetic. This means that an object which emits UV rays will be hotter than one emitting IR (infrared) radiation.
” The visible spectrum is a much smaller wavelength, and the human eye has evolved to see colors in this range of light. The study of these waves is called “electromagnetics.” Electromagnetic radiation extends from the lowest frequency radio waves at one end to gamma rays with very high frequencies on the other side. Different wavelengths have different effects on objects they interact with. Objects that are heated by IR (infrared) will feel warm while those affected by UV (ultraviolet) will be hot enough produce burns when touched. Nocturnal creatures like owls can’t see as far into the ultraviolet spectrum so their eyes prefer other ranges such as infrared or blue-green light instead for hunting nocturnal prey.”
