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Updated: May 6, 2025
A similar rotation is now familiar in the well-known tests of sugars lævulose and dextrose which rotate plane-polarized light to left and right, respectively.
'Now, two things are clear: first, that if the light be plane-polarized that is, if all the vibrations throughout the entire ray are rectilinear and in one plane they must in all their bearings have reference to a particular direction in space, so that they will be differently affected by different positions of the analyzer. This statement merely recapitulates a fundamental point in polarization.
And if we examine carefully the spectrum of light which has passed through a selenite, or other ordinary crystal, we shall find that, commencing with two consecutive bands in position, the parts occupied by the bands and those midway between them are plane-polarized, for they become alternately dark and bright; while the intermediate parts, i.e. the parts at one-fourth of the distance from one band to the next, remain permanently bright.
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