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 ...

A do-it-yourself Galilean telescope makes an excellent and inexpensive starter telescope — or science fair project. When you purchase through links on our site, we may earn an affiliate commission.

Telescope focal length determines image magnification. Field of view (FOV) shows how much sky your telescope displays. FOV is calculated using telescope and camera/eyepiece specs. Match telescope FOV ...

Learn how concave mirrors form images with a clear, step-by-step explanation that makes the mirror equation easy to understand. This lesson covers ray diagrams, focal length, image position, and ...