The mirrors used as rear-view mirrors in vehicles are

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concave

convex

cylindrical

plane

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This question was previously asked in

UPSC NDA-2 – 2017

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Rear-view mirrors in vehicles are typically convex mirrors. Convex mirrors form virtual, erect, and diminished images of objects. The principal advantage of a convex mirror for this purpose is that it provides a wider field of view compared to a plane mirror of the same size. This allows the driver to see a larger area behind the vehicle, enhancing safety. While the image is smaller (diminished), this is an acceptable trade-off for the increased field of vision.

– Convex mirrors produce virtual, erect, and diminished images.
– Convex mirrors provide a wider field of view.

Concave mirrors can produce real or virtual, inverted or erect, magnified or diminished images depending on the object’s position. They are not suitable for providing a consistent wide-angle view of distant objects. Plane mirrors produce virtual, erect, and same-sized images, but their field of view is limited compared to convex mirrors of the same size.

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