PASSIVE Most of the technology to create a 3D image is integral to the television.
ACTIVE Most of the technology to create a 3D image is integral to the glasses, but these 3D glasses can cost upwards of £100 per pair.
Part of the 3D effect is obtained alternating images for the left and right eye at a so great speed that it surpasses the two dimensions. In order to be able to take advantage of it, you will need special lenses (3D Glasses) that work much better than the the old red and blue glasses of years gone by. They can be a little uncomfortable at first, but it is worth it for the 3D effect. The present reproducers of Blu-ray will not support this technology, but PlayStation 3 will receive updates of Firmware to be able to do it. Then, to enjoy the 3D technology you are going to need some equipment:
1) A Blu-Ray with 3D capabilities or a PlaySation 3, etc)
2) A 3D TV able to show the stereoscopic images
3) The pair of special 3D spectacles
4) Media in 3D (games, films, special TV channels, etc)
The important thing, and what I liked most about 3D television, is not that it appears three dimensional, but the power to perceive the illusion depth. 3D is not intended to surprise or scare the viewer like it was in the first productions of 3D (Jaws 3D for example), but to offer a depth experience. The TV stops being a screen in that the images follow one another, but it becomes a window to a new world of television with volume and depth.
The spin angular momentum of photons manifests itself in the familiar phenomenon of polarisation – an effect that some sunglasses and even 3D glasses exploit.