How do red and green filter works in 3-D eye glasses?

Answer 1

For you to see in 3d each eye sees everything from a slightly different angle, off set to the right or left like a finger right in front of your face. If you look at something a few inches in front of your face you will notice how your eyes must also cross to look at it. If you look at something far away they uncross or get more parallel. So your eyes are seeing two images of the finger in front of your face, on for each eye. So to see in 3d we need double images of everything and then only one image can go to one eye and the other image only to the other eye, just like in real life. The left lens must block the image for the right eye and the right lens must block the left eye image.

Anaglyph glasses that are red and blue use those colors to block and unblock images. The double images are red and blue as well.

In the theater they use polarized light. All images for the left eye have one light wave and all images for the right eye have a second different light wave. Then the right lens will block the light waves of the left eye images. The left lens does the same. Television can not do polarized light waves so they use the above anaglyph 3d format.

Field sequencial 3d uses shutter glasses and looks just like polarized 3d and is often used for television as a better alternative to anaglyph 3d. The lenses use electricity to open and close. Now one lens will open while the other one closes and they do this back and forth really fast. Now when the image for the left eye flashes on the television screen the left lens will open. Then the right image will flash on the screen and the right lens will open. So each eye again only gets one image. This format requires and special tv, a convertor box, and the shutter glasses.

Now to get your eyes to cross and uncross so images look close and far away this is what happens. Lets say something starts off far away and then gets closer until it looks like it is right over the head of the person sitting in front of you. When far away the double images are separate and the image for the right eye is on the right side and the image for the left eye is on the left side. Your eyes are uncrossed. Now as it gets closer the images come together until it looks like one image. Now the images pull apart again but this time the image for the right eye moves over to the left side and the left image moves over to the right side causing your eyes to cross more. Now as the images get further apart your eyes must cross more and the image pops off the screen.

Answer 2

arabels and jessabels :p