ABSTRACT
It might perhaps be expected that this discussion should begin by saying what light really is; but this is notpossible, since light is more primitive that any of the terms that might be used in an effort to explain it. Thenature of light is describable only by enumerating its properties and founding them on the simplest possibleprinciples. As these principles transcend ordinary experience they must be cast in a purely logical (mathematical)form ….
