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THE WONDERS OF OPTICS.

direction B C, it is at A1, and not at A, that we shall see the object from which it proceeds. Every ray of light which passes out of a medium of a certain density into Refraction
Fig. 14.—Refraction

another of a different density is bent from its primary course, or, in scientific language, it is refracted. The Experimental Proof of Refraction.
Fig. 15.—Experimental Proof of Refraction.

experiments we made in a former chapter on the properties of the prism are founded on this principle.

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