Answer:
Typically, eyepieces with a focal length of 10mm are used for close-up observations, while eyepieces with a 20mm focal length are better suited for viewing distant objects. One of the essential eyepiece characteristics is the eyepiece focal length.
For some of the smaller telescopes, the eyepiece size to reach max useful magnification would be 10mm-20mm. Since there are no eyepieces of that size, the minimum we are using is 40mm.
The eyepiece is an essential part of the telescope as it magnifies objects and images so users can see them better. The eyepiece of 10mm focal length is suitable for close-up observations, whereas one with a focal length of 20mm is ideally suited to viewing objects far away.
This makes them among the best beginner telescopes The first choice to make is between a reflector and a refractor. A 6-inch reflector telescope uses mirrors to focus incoming light onto a secondary mirror, which then directs it toward the eyepiece (located either at the rear or on the side of the telescope itself).
Step-by-step explanation: