Question

Why are convex mirrors used instead of concave mirrors as rear view mirrors?

Answer 1

answer is:

Convex mirrors are commonly used as rear-view (wing) mirrors in vehicles because 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 would be possible with a plane mirror.

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Answer 2

For convex mirrors, diminished images means that images appears smaller than the objects, which means that a larger field of vision could be obtained. This is also why a convex mirror is preferred over a concave one.

The driver needs a wide view of the road situation that are (relatively) far away, and convex mirrors are able to acheive that.