In a wide beam, the dispersion spectra of neighboring thin points are superimposed on each other, and the result is white light. At the edges, this overlap occurs, so the edges are colored. The narrow beam is split into thin colored beams due to the different refractive indices for each color. These colored beams are spatially separated.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.