ace of the denser one) at v and », they are scription. again refracted from the perpendicular, and A is the box, being secured at the top, B, associated with it, it appears as if removed to will meet at the same point, L, behind y. and having two doors, D, for the admission of the position of the… … But, if the side of the lens toward the eye The advantayes and particular value of ever side a person approaches, either by the is also convex, as in the figure, the rays, 1, these gates have been so often expressed in carriage wheel passing over J, of which there a 1, will, in passing out of the…
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