Which color is produced by the emission of the highest energy photons?

Emission of the photons with the highest energy produces gamma rays, and you would not want to get any of those in your eye.  I don't know what color sensation they might produce, if any, but it could be the last color sensation you would ever experience with that eye.

WITHIN the range of wavelengths/frequencies perceptible to the human visual system, the highest-energy photons are the ones associated with the last color you can see on the VIOLET end of the rainbow.

concave lenses are used here. they spread the light out before it reaches the convex lens in the eye, therefore letting the image focus directly on the retina. hyperopia is known to you probably as farsightedness.

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods