![]() The light coming from the star falls on the primary mirror located at the end of the optical tube. This type of telescope uses mirrors instead of lenses, as in the previous one. That is, a large refractor will be quite expensive. The larger the lens, the longer the length of the optical tube in the refractor telescope should be for proper image focusing. However, it does not require any adjustments from the observer due to its stable optics. It is quite compact in size, which is why it does not collect as much light as a reflector. The light passes through the lens, creating light rays that converge on the eyepiece holder. It works on a similar principle to the monocular. This telescope is somewhat reminiscent of a spyglass and is most familiar to the novice. The refracting telescope is very easy to distinguish from the reflector because its eyepiece and focuser are located at the end of the telescopic tube. This is the first type of telescope, which was created in the early 17th century by the German-Dutch lens manufacturer Hans Lippershey.
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