He believed that luminous bodies emit rays of light, which are a stream of small particles (corpuscles), the direction of movement of which changes when passing from one medium to another. Newton considered the phenomenon of dispersion discovered by him as a justification for this. At the same time, he believed that if a flux of light corpuscles falls on a body, then a wave is excited in the ether filling the gaps between the particles of the body.
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.