This applet demonstrates the working of a refracting astronomical telescope. The telescope has two lenses called objective and eyepiece. The focal length of the two lensees can be changed by the user. As an example six brightest stars of the Pleiades, is viewed through the telescope and the resluting change in the image with a change in the focal lengths can be viewed. This applet part of large collection of physics applets by the author and may be accessed in a variety of languages here:

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