Passive is the type of 3D, there are two types, active and passive.
Active glasses are battery powered and work by using a shutter effect to open and close at a rapid speed. They cost about £40 each are quite heavy as they are battery powered.
Passive are the same as the ones in the cinema, so yeah you can just use those.
Active is better quality picture (I didn't think by much, but it technically should be twice as good), but the flickering can be eye straining.
Depends on how big your lounge is and how far you are sat from the screen. I'd want a minimum of 42 inches, just so it didn't need replacing for a good few years.
The main choice you need to make is size and 3D or not, after that its easy!


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