The magnification (or power) you will see through a given optical system depends on the telescope and the eyepiece. The simple formula is: Magnification = Focal length of telescope ÷ focal length of ...

I HAVE found the addition of a double concave lens to my telescope and microscope of so much service that I am anxious to call the attention of your readers to this simple application for increasing ...

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Current technology has given us breathtaking imagery, but to detect what’s hiding in deep space, telescopes are very limited. Although manned space exploration to distant worlds is figuratively ...