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1 Rear view mirror on motor bikes  side view mirrors on the side of cars
2 shopping centers on the corners of walls you find big covex mirrors. Also in schools, hospitals. This is to see if some one is coming from the right side or left side of the turn.  In the Blind junctions or turns, you find the convex mirror mounted on lamp posts.
3. some times behind the ATM mahcines, you find convex mirror. So you can observe if anything dangerous happens
4  camera phones or cameras can have the convex mirros, so you can see your position when taking a self portrait.
5 it can be used on the wall for make up etc. if the space is not sufficient for a big normal plane mirror.

 thumb tacks, Christmas baubles, sunglasses, diverging mirror passenger-side mirror,