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The rear view mirror is a wide rectangular mirror that you (the
driver) use to view anything behind the car. You don't have to take
your eyes off the road to turn your head around.
On most cars, the rear view mirror has a "day/night" selection switch
that tilts the mirror inside its glass housing without tilting the
exterior glass housing itself. The switch tilts the mirror upward,
about five degrees, to divert the majority of the light striking the
mirror up on to the headliner of the car. The light that you see when
the mirror is on the "night" setting is actually bouncing off the
glass housing (a good reason to keep it clean). The percentage of
light reflected into your eyes in the night position, is very small
compared to the amount that would normally be reflected into your
eyes in its normal position.
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