Assertion: eyepiece's length | /r/ObjectUse | used with a 20mm eyepiece
Facets:
Source sentences:
text: For example, a telescope with a 2000mm focal length used with a 20mm eyepiece will give 100 power (2000 ÷ 20 = 100).
text: For example, a telescope with a 2000mm focal length used with a 20mm eyepiece will give 100 power (2000/20 = 100).