ll compared with thedistance of a point which we can see distinctly, and the rayswhich enter it are all very close together. There are howevermany cases in which the rays do not fall normally on therefracting surface, but strike it obliquely as in fig. 57. Inthis case the rays from any point of the… … Fig. 57. 78 LIGHT. [CH. IV very nearly through a small circle called the circle of leastconfusion. The image of an object seen by oblique refractionis thus made up of a series of small circles of least confusioncorresponding to the various points of the object and is lessperfect than when the…
Heat · Light
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
