New answers tagged


If you mix pure red spectrum light with pure blue spectrum light, you don't get purple light. You get green light. Purple light does not exist, except as a construct of your perceptions when red and blue cones are both activated in your eye, but green cones are not. In other words, if all cones except green ones are triggered in your eyes, you perceive ...


No, the depths are reversed. The reason is that in free fusion (looking at the distance) each eye sees the image that correspond to its own side, that is, the left eye sees the left image and the right eye sees the right image, whereas in crossfusing (crossing your eyes), each eye sees the image on the opposite side, that is, the left eye sees the right ...


Not through our normal sight. First of all, doppler shift will totally change the color of everything, objects ahead of us shifting towards blue/ultraviolet, and these left behind becoming more red/infrared. Then, Lorenz Contraction combined with changed time and distance it takes light reflected off objects (and separately, emitted by objects) to reach our ...


There are devices called Monochromators, which can produce narrow band illumination with pretty good accuracy, so if implemented correctly, one may measure the visual range of a person, I would believe.


What comes to mind is separating white light (e.g. from the sun) through a prism, and using the colors in the spectrum with corresponding wavelength to determine what range you can see.


There are two effects at work here to form the Color Afterimage. The blue light stimulates the S-type cone cells most, and they simply "tire out". Local supplies within the cell of ATP become run down, and the cell cannot therefore signal as often or as effectively. When you looked away into a more "balanced" light, white light that would normally fire all ...

Top 50 recent answers are included