In Alaska, to tow a person on water skis or similar device you must have a rear view mirror or a person at least 12 years old to observe the skier.
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concave mirror is a solar device
While Alaska and Antarctica have much in common -- both being rather polar in their climates, they are not mirror images of each other. Humans have lived in Alaska for about 10,000 years: no people have ever lived in Antarctica -- the continent is too cold to support life.
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Convex Mirror
An acoustic mirror is a device used to reflect and focus sound waves, to provide early warning of incoming aircraft.
A heliograph is a device for sending messages or signaling by flashing the sun's rays from a mirror.
concave mirror is a solar device
An imaginary device, which like perpetual motion, does not exist.