A acts as the translator. It takes those two images and "interlaces" them. On a compatible 3D monitor or TV, it ensures that one set of polarized lines goes to your left eye and the other set to your right eye, creating the illusion of depth. Top 3D Video Players for Polarized Setups
While traditional 2D monitors often require "anaglyph" (red/cyan) glasses for a 3D effect, true polarized 3D requires a monitor with a built-in polarizing filter to split the light into separate images for each eye. Top 3D Video Players for Polarized Setups 3d video player for polarized glasses link
Watching 3D movies at home no longer requires a specialized theater trip. With the right combination of passive polarized glasses A acts as the translator