Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 115
Figure 81. —APencil LooksBent at theSurface ofthe Water. 104 REFRACTION AND LENSES … The ray travels in a straight line until it strikes theglass. The side a strikes first, and so is retarded, since light cannot travel inglass as fast as in air.This allows b to swingahead, since it is still inair. This continues untilboth a and b are inside theglass. Then they againgo at equal…
Physics
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-380-238.webp)
