E F perpcndi-cularis eft ad fiiperfiriem A E C B , cumper centrum ejus G tranfeat, Quare angu-lu^ inclinationis efi H E G. Reccdit autemin egreilii E r^dius H E a perpendiculariE F per fuppo£ 3. fiipra, dum fit tranfitus arnedio denliori ad rarius : igitur radius Re-fradus magis recedet a linea E D…
Optics, Geometrical · Optical instruments
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.