Why the rainbow have curve shape

1.	Why the rainbow have curve shape
Answer» Due to total internal reflection it is circular in shape But why it see in circles what reason behind it It is actually circular in shape but due to horizon it looks semi circular, a person in aeroplane will se it as circular and due to total internal reflection it becomes circular in shape It is not formed in curve it is complete circle but you are only able to see the half because we are standing at the horizon to the rainbow.

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