Science Festival Marseille 2009
This year, we were celebrating the 400th anniversary of Galileo Galilei's observations with the lens telescope. Therefore, one of our attractions was to re-construct one of these telescopes using magnifying lenses. It's very nice to see that five fold magnifications are readily available with two simple lenses (if you try to do it yourself, put the lens with greater focal length first; the larger the difference in focal lengths, the greater the telescope magnification; actually the magnification equals the ratio of focal lengths). See the pictures below !