A telescope is an optical instrument using lenses, curved mirrors [DISPUTED], or a combination of both to observe distant objects ...

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Our first Parsing Analysis diagram about telescopes
Overview of all diagrams after moving elicited model elements out of the '0-source' zone
A curved primary mirror is the reflector telescope's basic optical element
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A telescope is an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects ...
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https://en.wikipedia.org/wiki/Telescope
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Not all optical telescopes use only curved mirrors. A Newtonian reflector uses a flat secondary.
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A flat secondary mirror reflects the light to a focal plane at the side of the top of the telescope tube.
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The word telescope now refers to a wide range of instruments capable of detecting different regions of the electromagnetic spectrum, and in some cases other types of detectors.
The first known practical telescopes were refracting telescopes invented in the Netherlands at the beginning of the 17th century, by using glass lenses.
They were used for both terrestrial applications and astronomy.
The reflecting telescope, which uses mirrors to collect and focus light, was invented within a few decades of the first refracting telescope.
In the 20th century, many new types of telescopes were invented, including radio telescopes in the 1930s and infrared telescopes in the 1960s.
A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image.
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