Why does a rainbow arc shaped

Main Question or Discussion Point

We all know as to why we see a rainbow. But why do we see it in a the form a circular arc. Why not a straight line or anything else?

I was reading one book and that gave some reason that eyes make the a particular angle at the light from the drops of water. We all know the first part that we see a rinbow only at a particular angle, but I didn't get an answer as to why it arcs??
 

Answers and Replies

Thank you!!
 

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