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Incorporated, a worldwide network of science museums and related institutions.
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The telescope described in the original question is like the first telescope
popularised by Galileo, with a diverging lens as the eyepiece. Now these are
mainly used in cheap plastic toy telescopes.

I designed an interactive exhibit with the specific aim of helping people
'see' how an astronomical telescope (with two converging lenses) works.

http://www.interactives.co.uk/hands_mannheim.htm

It's basically a simple camera obscura, where you use a separate 'magnifying
glass' to look at the image formed on a screen by a larger, weaker objective
lens out in front of it. Then you flip the screen out of the way and can
still see the magnified image through the 'magnifying glass'. Bingo! A
telescope.

Ray diagrams in books are one thing, but a carefully designed interactive
exhibit can itself BE the explanation.

Promoting public engagement with science
through a contagious delight in phenomena
*
[log in to unmask] * http://www.interactives.co.uk
*
Give people facts and you feed their minds for an hour.
Awaken curiosity and they feed their own minds for a lifetime.
*
Ian Russell   (Twitter: ianrusselluk)

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