Rear view mirrors used in vehicles are convex mirror.

SI unit of potential difference is Volts.

The portion of the broad part of the file without teeth is called Heel.

Bronze is an alloy consisting primarily of copper, commonly with about 12–12.5% tin and often with the addition of other metals (such as aluminium, manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon.