The book Physics for High School Students was written by author Henry S Henry Smith Carhart Here you can read free online of Physics for High School Students book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Physics for High School Students a good or bad book?
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The figure on the screen is a section of the shadow. The darker part of the shadow, called the umbra, is caused by the total exclusion of the light by the opaque object ; and the lighter part, the penumbra, by its partial exclusion. When the luminous object is a point, as L (Fig. 120), then the shadow will be bounded by the cone of rays, Fig. 120. ALB, tangent to the object, and will have but one part, the umbra. When the luminous body has magnitude, as LL (Fig. 121), then the space ABDO behind... the opaque body receives no light, and the parts between AC and Fig. 121. 192 HIGH SCHOOL PHYSICS. Fig. 122. 'i and between BD and BD 1 ', receive some light, the amount increasing as AC 1 and BD 1 are approached. [The student should draw figures for the cases when the luminous body is larger than the opaque body, and when of the same size. ] 233. Images by Small Apertures. Experiment. Support in vertical planes two sheets of cardboard, A and B (Fig. 122). In the centre of A cut a round hole ^ B about 2 mm.
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