convex mirrors are used as rear view mirrors
Kindly refer to the link given below to know the reason behind it :
https://www.meritnation.com/ask-answer/question/why-a-convex-mirror-is-preferred-for-rear-view-mirrors/light-reflection-and-refraction/1693972
https://www.meritnation.com/ask-answer/question/why-a-convex-mirror-is-preferred-for-rear-view-mirrors/light-reflection-and-refraction/1693972