a galilien telescope consists of an objective of focal length 12 cm , eyepiece of focal length 4 cm .what should be the separation of two lenses when the virtual image of a
When building a refracting telescope, does the diameter of the eyepiece matter? And why do we need to move the eyepiece (as in my textbook) if the image is always focused at
![An astronomical telescope has an eyepiece of focal-length 5cm. If the angular magnification - YouTube An astronomical telescope has an eyepiece of focal-length 5cm. If the angular magnification - YouTube](https://i.ytimg.com/vi/WDPW9wsZgVA/maxresdefault.jpg)