Wright, Mark R., 1854- · London : Longmans · leaf 94
reen at some distance ;the image is round, or elliptical if we incline the screen. Every point in the surface of the sun prints its own trian-gular image. When the screen is near the hole, these imagesnearly coincide, and a triangular image is formed. When thescreen is moved away to a distance, the… … Fig. 58 The circular and elliptical patches of light seen under a groveof trees are formed by the rays of sunlight passing through smallapertures of varied shape formed by the overlapping of theleaves (fig. 58). 86 Light Shadows, TJmbra, and Penumbra.—Light travels in straightlines, therefore part…
Physics
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