The Prism

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Move your cursor over the image to highlight two example raindrops.

The light of the sun hits a raindrop where it gets reflected. Because the components of the light are slightly refracted there, individual raindrops only send specific colours to the eyes of the observer. Hence we see the light of raindrops from one area as red and from another area as blue or in the other colours. From other areas of the wall of rain, no light is reflected to the observer.

So from each drop, only one specific colour reaches our eye. This colour depends on the angle at which we look at the drop, because each colour is refracted into a slightly different direction. If you look at the rainbow from another position, the angle at which you look at each drop changes. Think about what that means for the rainbow to solve the task.