full-length bedroom mirror, make up mirror, car rear-view mirror, dental mirror, store security mirror, jeweller's mirror car side-view mirror, mirror in flashlight, shaving mirror, surface of lake. Tell me why
Under ideal conditions--ignoring hot days, cold air, and defects in manufacture....
full-length bedroom mirror: plane, to accurately reflect the image.
make up mirror: concave, to act as a magnifier.
car rear-view mirror: plane, for accurate viewing
dental mirror: plane, for accurate viewing.
store security mirror: convex, for wide-angle view
jeweller's mirror: concave, to act as a magnifier.
car side-view mirror: convex, for wide-angle view
mirror in flashlight: concave, to focus the light; it's usually a parabolic reflector.
shaving mirror: concave, to act as a magnifier.
surface of lake: very slightly convex! The surface of the water is equidistant from the center of the earth, making it curve--see the surface of the ocean and the horizon for an example. But the curve is so slight, most people would regard it as a plane surface.
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