Usually aluminum. It is normally deposited as a vapour to get an incredibly smooth surface.
In small home-made telescopes, they use silver.
The reflecting metal foil on the Hubble space telescope helps regulate its temperature by deflecting sunlight and reducing heat absorption. This insulation is crucial for maintaining the telescope's delicate instruments within a suitable temperature range to ensure optimal performance.
Isaac Newton invented the reflecting telescope.
It is a reflecting telescope
A reflecting telescope uses mirrors while refracting telescopes uses lens. The refracting telescope also had chromatic aberration and bad resolution while the reflecting telescope had none of these.
A Reflecting telescope has a lot of zooming technologies and the High Power telescope is highly powered.
A reflecting telescope is different from a refracting telescope because a reflecting telescope uses a concave lens, a plane mirror, and a convex lens. While a refracting telescope uses two lens.
one which reflects of mirrors
It is a reflecting telescope
The reflecting telescope
Those are, in fact, identical down to the finest detail.
He invented the reflecting telescope. Galileo was the first to use the telescope for studies of the heavens.
Reflecting Telescope