The discussion centers on the visibility of electromagnetic (EM) waves, specifically why they are not seen unless reflected by an object. Participants clarify that EM waves of optical frequency are inherently visible, but the human eye requires light to enter through its lens to perceive it. The eye detects light through photoreceptor cells in the retina, which respond to light and send signals to the brain for image processing. The conversation also touches on the concept of distance perception and how the brain interprets the angular separation of light sources.
PREREQUISITESStudents of physics, optical engineers, and anyone interested in understanding the nature of light and human vision.