Question

why can't we observe a single ray of light with our naked eye? ​

Answer 1

Answer:

see this attachment hope it's helpful to you

Answer 2

Answer:

Infrared waves are a portion of the light spectrum that follows red. They have longer wavelengths than visible light, ranging from 700 nanometers to one millimeter. This renders them invisible to humans in almost all conditions. There are limited situations, though, when humans can see infrared light.