I was studying the phenomena of the formation of a rainbow. In my book, the following diagram is given:

So, the rays at the red end of the spectrum make a larger angle with the incident ray than the rays at the violet end of the spectrum. However, whenever we see a primary rainbow, the red is always on the top.

Why is it so? I know there is an obvious explanation and I am surely going wrong somewhere in my understanding. Please help me understand my mistake.