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1 Fretting corrosion is primarily a surface damage phenomenon occurring as a result of small cyclic movements between two materials caused by cyclic loading. Fretting damage can occur in vacuum, although it then would be better to speak of fretting, rather than fretting corrosion.
I found this the easiest way to do it: Look through the combiner glass and through your windshield at an object far away (let's say a tree). Notice how when you focus on that tree, the display splits into two images because your eyes are no longer focused on it. fresnel lens is used to optically collimate the display, which is projected onto a piece of combiner glass. The difference between this and most third-party HUDs is: 1  It's optically collimated. 2  This means the display is focused at infinity, so the driver does not need to refocus his eyes from the road.