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(D) In an astronomical telescope,the distance between the objective and the eyepiece is $f_o + f_e$. To make it a terrestrial telescope,an erecting le

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$4f$

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(D) In an astronomical telescope,the distance between the objective and the eyepiece is $f_o + f_e$. To make it a terrestrial telescope,an erecting lens of focal length $f$ is placed between them. For the erecting lens to form an image of the same size as the object,the object (which is the image formed by the objective) must be placed at a distance of $2f$ from the erecting lens,and the image will be formed at a distance of $2f$ on the other side. Thus,the total distance added between the objective and the eyepiece is $2f + 2f = 4f$. Therefore,the length of the telescope tube increases by $4f$.

$A$ terrestrial telescope is made by introducing an erecting lens of focal length $f$ between the objective and eyepiece lenses of an astronomical telescope. This causes the length of the telescope tube to increase by an amount equal to

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