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A reflecting telescope only needs one mirror, the primary mirror which will focus incoming light to a single point.

A digital telescope might place the digital recording media directly in front of the reflecting telescope without any additional mirrors (although perhaps some lenses).

For practical purposes though, most optical telescope will have a secondary mirror that will either focus light straight back through a hole in the primary telescope mirror, or to the side of the telescope.

Some telescopes, especially the large ones in observatories will have several mirrors directing the light path to the observer or recording equipment.

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Q: How many mirrors does a reflecting telescope have?
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