75. The point at which rays parallelto this axis meet after passing through the lens, as inFig. 76, is called the principal focus of the lens. Experiment 69. —Take a lens that is thinner in tlie middle than atits edges and note its effect upon rays of light, in the manner indicatedin the above… … Fig. jj. Formation of Images by Convex Lenses. — Ex-periment 70.— Hold a convex lens in front of awindow and hold a paper behind it at its principalfocus. When the distances are just right, a small inverted image ofthe window will be seen upon the paper. Account for the view in the - finder of a…
Physics
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