What is the tube length of a telescope?

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(B) The tube length of a telescope is defined as the distance between the second focal point of the objective lens $(F_o)$ and the first focal point o

Vedclass · Accepted Answer

The distance between the focal point of the objective and the focal point of the eyepiece.

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(B) The tube length of a telescope is defined as the distance between the second focal point of the objective lens $(F_o)$ and the first focal point of the eyepiece $(F_e)$. For a telescope in normal adjustment,the tube length is equal to the sum of the focal lengths of the objective lens $(f_o)$ and the eyepiece $(f_e)$,expressed as $L = f_o + f_e$.

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