Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 328
and theshadow is not so simple. The simple relation mentionedabove holds between the screen and the shadow formedby any poiyit of the luminous body; but as the shadowsfrom all the points overlap^ the entire shadow formed byall the points of the light is complicated. In Fig. 193, the light from a… … light falls outside thecircle Va^ until the circlea^^V^ is reached, wdien allthe light from every point reaches the wall. WithinVa\ then, there is a uniform dark shadow. This iscalled the umbra. Without Va^ the shadow becomesgradually less dark until a^^V^ is reached. This portionis called the…
Physics
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