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The Hague, Netherlands (/1629/ - /1695/)
Using the Paris Observatory (completed in 1672), Christiaan Huygens made further astronomical observations. In 1684 he published Astroscopia Compendiaria which presented his new aerial (tubeless) telescope.





The Glass & Mirrors Toolkit

If you have access to some lenses and mirrors in your school science supply room, this set of demonstration activities will help your students understand more about how telescopes work, the differences between telescopes made with mirrors and those made with lenses, and how we are continuing the tradition of Galileo and Newton in building new telescopes today.

Big Questions

How do telescopes actually work?
Why are bigger telescopes better?
What’s the difference between telescopes made with lenses (refractors) and telescopes made with a mirror (reflectors)?
How are the telescopes of Galileo and Newton similar to telescope designs today?

Big Activity

Using a simple setup with lenses and mirrors, demonstrate how a telescope collects light, focuses it, and then magnifies the image.


Presenters: A minimum of one person.
Visitors: Up to 10 people at a time is appropriate.


About 15 minutes.

The Glass and Mirrors manual is a 34-page PDF file. Click here to download.

Contributed by Astronomical Society of the Pacific.




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