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In a prime focus design no secondary optics are used, the image is accessed at the focal point of the primary mirror.

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A curved primary mirror is the reflector telescope's basic optical element
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In a prime focus design no secondary optics are used, the image is accessed at the focal point of the primary mirror.
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https://en.wikipedia.org/wiki/Reflecting_telescope#Technical_considerations
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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.
The reflecting telescope, which uses mirrors to collect and focus light, was invented within a few decades of the first refracting telescope.
A curved primary mirror is the reflector telescope's basic optical element that creates an image at the focal plane [OF THE PRIMARY IF THERE IS NO SECONDARY]. The distance from the mirror to the focal plane is called the focal length.
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