Question

Why we prefer to use a convex mirror as a rear view mirror?

Answer 1

we use convex mirror for rear view because convex mirror forms finished image of object that why we are able to see long distance behind us and observe it
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Answer 2

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We prefer a convex mirror as rear-view mirror in vehicles because of the following reasons :

(i) A convex mirror always produces an erect image (right side up image) of the objects.

(ii) The image formed in a convex mirror is highly diminished or much smaller than the object, due to which a convex mirror gives a wide field of view (of the traffic behind).