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Traditional computer systems typically use 2D displays, which have a fixed focal depth.
Traditional computer systems typically use 2D displays, which have a fixed focal depth.
−Ray based gadgets are based on [[ray]]s. These include [[heads up display]]s in cars.
+Ray based displays use the concept of light going in straight lines, [[ray]]s. These include [[heads up display]]s in cars.
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==By position==
==By position==