In it he discussed experiments into the nature of light, including how light splits into its constituent colors, reflects off mirrors, and bends when passing from one medium into another.
Éí adinídíín bitsʼą́ą́dóó haitʼéego colors ałtsʼą́ąjįʼ ííłʼı̨́įgi, biiʼadéestʼı̨́ı̨́ʼ haitʼéego nátʼą́ą́ʼ adinídíingo ííłʼı̨́įgi, dóó náánáłahjįʼ biih nááʼdiidláadgo haitʼéego łah átʼįįhgi díí naaltsoos yaa halneʼ.jw2019 jw2019