Why do we prefer a convex mirror as a rear-view mirror in vehicles?
We prefer convex mirrors as rear-view mirrors in vehicles because they always give an erect image, though diminished in size. This helps the driver see the traffic behind clearly without any confusion about the orientation of objects.
Additionally, convex mirrors have a wider field of view as they are curved outwards. This enables the driver to view a much larger area than would be possible with a plane mirror. Thus, convex mirrors help the driver see traffic behind and facilitate safe driving.
Explanation
The textbook explicitly states two main reasons for preferring convex mirrors as rear-view mirrors: (1) they always give an erect (though diminished) image, and (2) they have a wider field of view because they are curved outwards. These properties allow drivers to see a much larger area behind them compared to plane mirrors, which is essential for safe driving.