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
The mirror field can be used to improve the device's performance by reflecting and redirecting light or signals, increasing efficiency and accuracy.
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.
onomatopoeia
imagery
Convex Mirror
personification
A heliograph is a device for sending messages or signaling by flashing the sun's rays from a mirror.
An imaginary device, which like perpetual motion, does not exist.
concave mirror is a solar device