. Practical physics. iantly colored in different hues. These are due to the factthat the lights of different wave lengthform interference bands at differentplaces on the screen. Notice that theupper edges of the bands (lower edgesin the inverted image) are reddish,while the lower edges are bluish. Weshall find the explanation of this factin § 465. Composite nature of whitelight. Let a beam of sunlight passthrough a narrow slit and fall on a Fk,. 4J0. White light decom-prism, as in Fig. 440. The beam which posed by a prism enters the prism as white light is dispersed into red, yellow, gre
. Practical physics. iantly colored in different hues. These are due to the factthat the lights of different wave lengthform interference bands at differentplaces on the screen. Notice that theupper edges of the bands (lower edgesin the inverted image) are reddish,while the lower edges are bluish. Weshall find the explanation of this factin § 465. Composite nature of whitelight. Let a beam of sunlight passthrough a narrow slit and fall on a Fk,. 4J0. White light decom-prism, as in Fig. 440. The beam which posed by a prism enters the prism as white light is dispersed into red, yellow, green, blue, and violet lights, although eachcolor merges, by insensible gradations, into the next. This band ofcolor is called a spectrum. We conclude from this experiment that wliite lUjlit is a mix-ture of all the colors of the spectruni, from red to violet inclusive. * The experiment may be performed at home by simply looking throughred and green glasses at a soap him so placed as to reflect white light to the 404 COLOR PHENOMENA 466. Color of bodies in white light. Let a piece of red glass beheld ill the path of the colored beam of light in the experiment of thepreceding section. All the spectrum except the red will disappear, thusshowing that all the wave lengths except red have been absorbed by theglass. Let a green glass be inserted in the same way. The green portionof the spectrum will remain strong, while the other portions will begreatly enfeebled. Hence green glass must have a much less absorbingeffect upon wave lengths which correspond to green than upon thosewhich correspond to red and blue. Let the green and red glasses be heldone behind the other in the path of the beam. The spectrum will almostcompletely vanish, for the red glass lias absorbed all except the red rays,and the green glass has absorbed these. We conclude, therefore, that the color which a body has inordinary daylight is determined by the wave lengths whichthe body has not the power of absorbin
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
