Astronomy › Section F · Astronomical instruments › Topic F.1
Telescopes
A telescope is a bucket for light. Its job is to collect far more light than your eye can and bring it to a sharp focus, and the size of its main lens or mirror matters far more than how much it magnifies.
In this topic
- Three parts of an observing system
- From the naked eye to Galileo
- Collecting light: aperture is everything
- Worked example: a mirror against an eye
- How a lens forms an image
- Worked example: magnification
- Refracting telescopes
- Reflecting telescopes
- Where the light is focused
- Common mistakes to avoid
- Key takeaways
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