He argued that white light is really a mixture of many different types of rays which are refracted at slightly different angles, and that each different type of ray produces a different spectral colour. Newton was led by this reasoning to the erroneous conclusion that telescopes using refracting lenses would always suffer chromatic aberration.
He argued na puti ang ilaw ay talagang isang timpla ng maraming iba't-ibang uri ng ekis na kung saan ay refracted at bahagyang iba't-ibang angles, at na ang bawat iba't-ibang uri ng ray produces multo ng ibang kulay. Newton ay humantong na ito sa pamamagitan ng pangangatwiran na ang mga maling palagay na ang paggamit ng teleskopyo refracting lenses ay laging magdusa kromatiko pagkaligaw.