A dark mirror is commonly used for scrying (looking into the future). A dark mirror however, is not the same as a regular mirror.
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Specifically, it is called enoptromancy. Generally, it can be called scrying.
Enoptromancy
Some practical uses for concave and convex mirrors are in medical instruments, car mirrors, and telescopes.
Magnifying mirrors, make-up mirrors, telescopes
•Write down about all the uses we make of mirrors?
the reflecting telescope uses mirrors and lenses. The refracting telescope does not include the mirrors.
Mirrors.
we use plane mirrors in our homes everyday, like dressing table mirrors, cupboard mirrors, etc.
a kaleidoscope uses mirrors to produce images that have several lines of symmetry
that mirror is mystery
the reflecting telescope uses mirrors and lenses. The refracting telescope does not include the mirrors.
5 uses of mirrors
Allows the driver to adjust mirrors from the seating position he will be in when he uses them. Also allows him to safely adjust mirrors while driving.
Mirrors, jewelry, etc.