From ultraviolet to infrared (115 to 2500 nanometers).
visible light
HST is a Cassegrain reflecting telescope using the Ritchey–Chrétien design, with an aperture of 7.9' (2.4m). It has observational ability in the Ultraviolet, Infrared, and Visible light spectrums.
The HST is a so-called Cassegrain reflector.
-- A concave mirror gathers the light and bunches it up all in one place, called the "focus" of the mirror. There's a "real image" at that place, and you can capture it with a piece of ground glass, tissue, photo-film, or light-sensitive device at that place. -- A plane mirror doesn't gather anything. It just kind of sends the light back toward where it came from. It doesn't form any real image, and there's nothing to capture.
A refractor
visible light
It is the one kind of telescope use in space. The Hubble Space telescope, is the one of the most common used-technology in space. The Hubble Space telescope was named after Edwin Hubble.
HST is a Cassegrain reflecting telescope using the Ritchey–Chrétien design, with an aperture of 7.9' (2.4m). It has observational ability in the Ultraviolet, Infrared, and Visible light spectrums.
The Hubble telescope can take extremely detailed pictures using mirrors in space.
The Hubble Space Telescope, or HST, or just the "Hubble" for most folks, is a Ritchey-Chrétien reflector telescope. It has a primary mirror to reflect and focus the incident light. A link is provided below.
The computer components in the Hubble telescope were custom-designed by IBM. It would be difficult to compare it to any consumer computer system.
INvisible light
That's a "reflecting" telescope.
A telescope on Earth has two main limitations: the Earth is rotating, and the atmosphere disturbs light from stars. Once the Hubble is aimed at an object, it is held pointed at the object by on board gyroscopes. There is no obstruction, such as the atmosphere, between the object and the Hubble.
A single-mirror reflector.
An optical telescope (as distinct from, say, a radio telescope). It's possible that the answer was intended to be "a refracting telescope" but reflecting telescopes use lenses as well.
A small reflector telescope usually is less useful than a small refractive telescope, especially when there is plenty of light, but when one needs a large telescope and there is not much light, then the reflector telescope can be made much lighter than the refractor and usually much larger. It also can gather more light which is very useful in astronomy. It also does not have to pass its light through thick large lenses that absorb part of the light. What is more, it can reflect almost any kind of light, from microwave radio to ultraviolet, while it is difficult to make lenses for large refractor telescopes that do not absorb some kinds of light such as infrared and ultra violet. There also are advantages when one wants to see in more than one wavelength (colour) of light. It is difficult to prevent the different colours from separating out when passing through a large lens, but a reflector telescope does not have this problem much.