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Updated: May 2, 2025
Hence, also, his measurements were concerned as optical science acknowledges with group-velocity only. In fact, even Bradley's observations, although he was the only one who operated with continuous light-phenomena, are exposed to the charge that they give information of the group-velocity of light, and not of its wave-velocity.
Hence they directed their attention first to those spheres where light manifests its form-creative activity, as in the moulding of the organ of sight in animal or man, or in the creation of the many forms of the plant kingdom and only then gave their mind to the purely physical light-phenomena.
But setting aside the Mystic School, which it behoves us not to speak of, seeing it is condemned by law, there are no men living more subtly wise in matters pertaining to aerial force and light-phenomena, than the Servants of the Secret Doctrine of the Temple.
For normal eyesight, the phenomenon on the screen differs in no way from what it would be if no prism intervened in the path of the light. These two seemingly identical light-phenomena reveal at once their inner dynamic difference if we narrow the field of light from either side by introducing into it an object capable of casting shadow.
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