There’s this almost common occurrence in Nigeria for car broken side mirrors to be replaced with plane mirrors. This is a potentially dangerous thing to do because plane mirrors which gives a standard reflection, does not allow a driver an areal view of the surroundings when on the road. The reason convex mirrors are desirable for side mirrors is it’s ability to reflect a reasonably wider rear-side view of the car, increasing visibility of vehicles approaching the car from the rear.

Please follow the link below to read more:
https://www.spotdem.com/2020/01/29/importance-of-convex-side-mirrors-in-a-car/