reflector

Definitions

Telescope which uses a mirror, rather than a lens, as the prime optical component to collect light. There are a variety of reflector configurations, including Newtonian, Cassegrain and others, which account for most of the world’s large telescopes. Reflectors have ousted refractors partly because it is cheaper to make a mirror of the desired accuracy – there is only one surface to get right – and partly because telescope engineering is rendered far simpler by having a main optical surface which can be supported from behind and which is sited at the bottom rather than the sky end of the telescope.

noun part of a headlamp which receives light from the bulb and reflects it back through the lens
noun part of a rear lamp cluster which reflects the light from headlamps behind

An object, material, device, or system utilized to reflect images, sounds, heat, particles, waves, or the like.
A surface that reflects light. Such a surface is usually smooth, highly polished, and it may consist, for instance, of a thin layer of silver or aluminum on glass. Reflectors have many applications, including their use in lasers, beam splitters, microscopes, TV cameras, and digital micromirror devices. Also called mirror (1).
A material which is placed around the core of a nuclear reactor to reflect neutrons back to said core, preventing their escape. Also called tamper (1).

A spotlight or floodlight unit that contains both the lampand a shiny back surface to intensify and focus the beam of light.

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