You can only see rainbow if you have your back to the sun

Photo courtesy: Shafaet Alam Abir

To make a rainbow, sunlight has to shine into a raindrop (bending as it moves from the air into the water), bounce off the far side of the drop , and then leave the drop (bending again as it moves from the water to the air). So if you’re going to see a rainbow, you have to be standing where your eyes can intercept this colored light. That means you have to stand with your back to the sun, so that the sunlight is shining into the raindrops from over you shoulder.

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