Asked by thalia

a certain Galilean telescope has a magnification of 2 times. if the focal length of the objective lens is 60 cm, how long is the telescope? thanks :))

Answers

Answered by bobpursley
A refractor's magnification is calculated by dividing the focal length of the optical tube with the focal length of the eyepiece.[1]

M=fo/fe

fo=length of tube=2*60cm
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