Question: How do the lenses on 3D glasses (non-colord) make a picture/video 3D?
I know that the video/picture is taken from two sperate wide angels, and put on top of each other, which is why the video is blury when there off. But what do the lenses hold that makes it appear 3d? I'm speaking of the newer, 3d glasses that are clear. Not the red and blue eye difference.
There are 2 types of 3D glasses - passive and active.
Passive glasses look sort of like a pair of sunglasses. These are the type used in movie theaters, and by a few 3DTVs for your home. The lenses are polarized, so they only let light that's traveling in a certain way through, while other light is reflected. (you can read more about polarized light on Wikipedia, eHow, or a basic science book.) The picture on the screen is composed of 2 images, one for your left eye, and one for your right eye. These images use polarized light that's traveling in different angles, so your left eye only sees the left-eye-image and the same for your right eye.
Active glasses use a mechanical shutter that flips open and closed in sync with the TV. When your TV displays the image for your left eye, the shutter flips closed over your right eye. Then the TV displays the image for your right eye, your right eye shutter opens, and your left eye shutter closes. You can sort of simulate this effect by winking rapidly with your left eye then right then left eye then right eye... The glasses and TV do this 'winking' 120 times a second.
In either case, the goal is to simulate how human vision operates. Each eye receives a slightly different image, and the brain combines them to form a single, 3d image. If you close just your left eye, then just your right eye you'll notice the two images you see aren't quite the same as the image you see when both your eyes are open.
Theres 2 types of 3d active and passive. Active shutter glasses flicker on and off at twice the frequency of the picture being displayed on the tv set. What you are seeing is a left eye image and a right eye image that alternate (left on right off, right on left off) tricking the brain and creating the illusion of 3d. Passive glasses create the illusion of 3d by bending the light with polarized lenses.