The screen in an IMAX 3D theatre is typically much larger than a traditional movie screen, and the aspect ratio is wider, which allows for more immersive visuals. The screen is also coated with a special material that reflects polarised light, which allows the polarised glasses to work effectively.
Viewers wearing the polarised glasses see the two slightly different images projected onto the screen as one unified image, with the illusion of depth. The glasses block out the light from one of the projectors, so each eye only sees the image that is intended for it. This creates the stereoscopic effect and allows viewers to experience a more realistic and immersive viewing experience.
IMAX 3D uses a combination of advanced technology, large screens, and polarised glasses to create a unique viewing experience that transports viewers into the movie world, making them feel like they are actually part of the action.