For the telescope is in normal adjustment (i.e., when the final image is at infinity)? what is the separation between the objective lens and the eyepiece?
Focal length of the objective lens, fo = 140 cm
Focal length of the eyepiece, fe = 5 cm
In normal adjustment, the separation between the objective lens and the eyepiece = fo + fe = 140 + 5 = 145 cm
Concept: Optical Instruments - Telescope
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