Noun. 1. invariant-a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it. characteristic, feature-a prominent attribute or aspect of something; the map showed roads and other features; generosity is one of his best characteristics.
The part of the sun that is going to emit the most visible light is going to be the Photosphere.he photosphere is the layer of the sun that emits visible light.  The light is emitted by hydrogen atoms and is bright red. Edit. Share to: Answered. In Astronomy.
However, rather than exhibiting a single wavelength, visible light is usually a mixture of wavelengths whose varying composition is a function of the light source from which it is emitted. During day-to-day living, most people encounter only a small number of visible light sources. When venturing outside, for instance, the vast majority of the light that can be seen is emitted from the sun, which also emits many other frequencies of radiation that do not fall in the visible range. Inside, however, visible light primarily comes from artificial sources, most often fluorescent or tungsten devices.