To convert back and forth, remember that there are 2.54 centimeters to an inch. And, there are 10 millimeters in one centimeter. To convert from inches to millimeters, multiply the number of inches by 25.4. So, here is your test. Click here when you are ready for the answer .
Magnification is a measure of the number of times the image is enlarged.
A pair of 7 power binoculars magnifies the image 7 times. To find the magnification for a particular eyepiece in your telescope, first find the focal length of the eyepiece. This is probably stamped on the eyepiece, or the available sizes are listed in astronomy catalogs. Second, find the focal length of the telescope. If you don't know the focal length of the telescope, it is equal to the focal ratio times the aperture.