Why are telescope mirrors made of glass?
And are they just not made of a metal since glass mirrors are finish with metals.
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ALES LOMBERGAR is one of the few artisans in Europe who still practice the ancient art of glass acid etching which flourished in the late 19th century. Decorations are applied with resin resists by hand and then exposed to acid baths, with no machinery used. More information here.Recent in portfolio
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RainbowPop
on February 8th, 2012
Glass is more dimensionally stable – it doesn’t expand or contract when the temperature changes – and it can be polished to a very smooth surface. The finish is a very very thin layer of metal.
Read “The Perfect Machine” by Ronald Florence if you want to learn more.
YvY
on February 8th, 2012
may be because glass reflects better
NeverAlone
on February 8th, 2012
Telescope mirrors are highly polished concave lenses with a thin metal lining on the back side. They are “concave” on one side, flat on the bottom side. Concave is thin in the middle and thick around the edges. Metal would contract and expand as temperature changes so therefore would not be of value in observing. The “Pyrex” glass of telescopes resists these temperature changes so is a readily stable medium. The largest single mirror in the USA is the Palomar Observatory. It has a mirror 200 inches across. We do have a multi morro scope that gives the impression that it is larger but it has more than one mirror. Six I believe. The 236 in mirror in Russia is the worlds largest single mirror. Except for the curvature of the earth, if a candle was lit on the sidewalks of London, Palomar could see it.