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Why are mirrors often slightly curved (convex)?

A They give a wider field of vision
Explaination
Although a convex mirror gives a wide view of the scene behind, you should be aware that it will not show you everything behind or to the side of the vehicle. Before you move off you will need to check over your shoulder to look for anything not visible in the mirrors.
B They totally cover blind spots
C They make it easier to judge the speed of following traffic
D They make following traffic look bigger