Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
e cross-lines becarried around the earth and sun, it Avill describe the circumference ofthe penumbra, L, as far as the extent of the shadow. The breadth of the penumbra increases with the diameter of theluminating body, and with the distance which the shadow extendsbehind the opaque body. The… … bodies (or from bodies reflecting light) reaches the place where theshadow is formed. This is shown by light from two or more luminouspoints falling on the same opaque body. Let A be an opaque body illnniinated by three candles. The light Ewill produce the shadow L ; tlie light F, theshadow K; the…
Physics · Astronomy
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