Let's start to methodically study nature again. In the case of light phenomena, the most necessary methodology for us is to study what happens to a single beam of light. If we know this, we can often tell what happens when there are a lot of light rays.

In this experiment, the slot and grating are connected together just to make the experiment easier. However, the idea remains the same: a narrow beam (light beam) is separated from the light of the light source by means of a slit.

In the experiment, we learn that the grating or rainbow glasses bend the light beam away from the direct direction. But, as a big difference from, for example, a mirror, the grating deflects light of different colors from the direct direction to a different degree. Red more, blue the least. This is how a rainbow is created.

If you do not succeed in assembling the test according to the scheme, you can watch the following test video.