Report Abuse. Calcium can exist in solid, liquid, or gas form, depending on the temperature. And anything which does not occur naturally is synthetic. The word has nothing to do with elemental properties, as far as I know.twitching_green_grasshopper Â· 7 years ago.olid, liquid and gas are states or phases of an element or substance. But most substances can exist in all three states depending on temperature and pressure.
The basic premise of the telescope tube is to align two lenses the appropriate distance from each other. For this telescope, the lenses are a concave convex (one side curved out and the other curved in) and a plano concave (one flat side and one side curved in). The plano concave lens is used as the eyepiece with the plano (flat) side facing the eye.
Cassegrainian telescope, Gregorian telescope-a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror.eflecting telescope-optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece; Isaac Newton invented the reflecting telescope in 1668.