Where is the Rainbow?

Nice solution sir! By the way, don't know you also master at Physics related problem!

This picture is misleading. You aren't seeing a projection on the sky behind the water droplets, but rather each individual droplet sends a tiny bit of rainbow directly to your eye (if it's at the correct angle)

The picture is plain wrong. The viewer would have to turn 180 degrees to see the refracted light as pictured. In fact, the problem is not stated correctly as water droplets are 3-dimensional, thus refracting and reflecting light in many directions, making a rainbow visible from a range of viewpoints, not just "away" from the sun.

Here are two Korean adages:

"Don't cross the river when there's a morning rainbow."

"Don't tie your cow by the riverside when you see a rainbow in the west sky."

Try and infer that this makes sense from this problem and the climatic and latitudinal condition of the Korean peninsula. :)

But water droplets have been studied and proven to be more spherical than..... pointy???..... You get my point. That artistic representation is incorrect!

Most importantly, since your eyes move independently from your head, the direction you face is less important Thant the direction from which your eyes look

When you can see a double rainbow , the second (upper) one is light that has been reflected twice in the individual raindrops , and the colours are reversed. It's also possible , though very rare , to have a triple!