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.
Types of simple lenses. Lenses are classified by the curvature of the two optical surfaces. A lens is biconvex (or double convex, or just convex) if both surfaces are convex. If both surfaces have the same radius of curvature, the lens is equiconvex. A lens with two concave surfaces is biconcave (or just concave).