The separation of white light into its component colors is called refraction and it is called light propagation. We say that these two relations are constant but, due to the nature of light, the degree of refraction due to each other, that which is contained in each connection must necessarily be opposite in value. That is the fundamental, and therefore one of the central points of space, is that which is contained in each other.
This is a physical phenomenon that affects light during the transition from one transparent medium to another: this phenomenon includes modifying the direction of light propagation during the medium change. In other words, it is the deflection of light when the light changes the medium.
Some relevant colors and wavelengths:
Yellow 591-574 nm
Violet 456-394 nm
Orange 624-596 nm
Red 781-621 nm
Green 578-491 nm
Blue 499-451 nm
Any transparent medium is characterized by its refractive index, which characterizes the ability of the medium to refract light during the transition between the vacuum and the medium.
A medium with a refractive index close to 1 hardly refracts light from a vacuum: the light is hardly deflected, so the refractive index of this medium is very small. The greater the refractive index of the medium, when it is greater than 1, the more obvious the refraction of the light from the vacuum: the light is deflected more, and the medium with a high refractive index is called refraction.
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