How do I know if I have an active or passive 3D TV?

To determine if your 3D TV is active or passive, check the type of 3D glasses it uses. Active 3D TVs require battery-powered glasses that sync with the TV to display images, typically providing better image quality and brightness. In contrast, passive 3D TVs use lightweight, polarized glasses that do not require batteries and are similar to those used in cinemas. Additionally, you can consult the TV's manual or specifications online for detailed information.