Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
n the middle than at theiredges. These are 2, 4, 6, and 8. Divergent lenses have greater con-cavity than convexity, and, therefore, arethinner in the middle than at their edges.These are 5, 7, and 9. 15 236 OPTICS. Jf06. Figure 33.—Refraction by -prisms.—Finding ihe di-rection of the refracted and… … To find the point at which the ray will emerge from the prism on its,opposite face, first draw the dotted line, BF, through the point of in-cidence, perpendicular to the face of the prism, and ALB will be theangle of incidence, which will be to the angle of refraction as 1.5 is tO1. Now erect a…
Physics · Astronomy
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