Why do we prefer convex mirror as a rear view mirror in vehicles?
Answers
Explanation:
Concave mirrors (which are spherical-surface segments with the center bulging nearer to the viewer) do the following to all objects visible within the mirror's borders:
All incoming light is reflected in divirging directions, so that they appear to come from objects “behind” the mirror, and therefore smaller than they are in real life (or would appear if their light was bounced off of a plane mirror, like the one on the driver's side.)
Because they appear smaller they appear farther away, which is an admitted difficulty if the driver is a total neophyte who has never had any driving instruction, or has never had this explained to them, even once. This is why the warning is etched into the mirror's surface, a permanent monument to the Auto Mirror Manufacturer's eternal low opinion of all drivers' intelligence level.
However, the up sided of this downside is that the images formed on your retina are always erect and reversed, meaning that no matter how far your eyes are from the mirror the scene appears exactly as it would if you turned around in your seat and looked out the back window, bar three things:
The scene is reduced in size in the mirror, so if you rotate to look out the back window, things will appear to be the size (and distance) that they actually are,
The back window may be smaller than “optimum”, so the scene may be vignetted by the edges of the window and downright blocked by the Sideposts,
The act of turning yourself around while driving is so heinous and dangerous an act that auto designers put the mirrors there to use… so why not do so?
And, in fact, there is a distance from the convex mirror where all light from the scene is turned into parallel rays, which your eyes try to turn into a spot.
The rest of the distances you might see, show objects turned upside down, and are even more frustrating to use for navigation clues than a concave mirror could ever be, so if you had a convex mirror, it is far more likely to be useful to plucked your eyebrows or shave your chin than for driving.
hope it helps u....
Explanation:
Convex mirrors are commonly used asrear-view (wing) mirrors in vehiclesbecause they give an erect, virtual, full size diminished image of distant objects with a wider field of view. Thus, convex mirrors enable the driver to view much larger area than wouldbe possible with a plane mirror.