Convex mirrors are used as rear-view mirrors in the motor vehicles because:

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They reflect light better than the other mirrors

They produce images which are more clearer than those produced by others

They produce magnified images

They form images which are much smaller than the objects

answer is D.

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Detailed Solution

Concept: A concave lens constantly creates imaginary, erect, and smaller-than-the-object pictures. Real and virtual images can both be formed using a convex lens. Depending on the object's proximity to the concave mirror, it can create pictures that are real or imagined, magnified or shrunk, and upright or inverted.
Here we have to find the correct option, by using the property of convex mirrors to capture an image smaller than it appears.
As we know that a convex mirror is used by the driver to see the traffic following him as in convex mirror images appear smaller and a large view can be seen in the small mirror.
Hence convex mirrors are used as rear-view mirrors in motor vehicles because they form images which are much smaller than the objects.
Hence, the correct answer option (4) .

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