The length of an astronomical telescope for n | vedclass

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(C) For an astronomical telescope in normal adjustment,the final image is formed at infinity.The objective lens forms the image of a distant object at

Vedclass · Accepted Answer

$f_o + f_e$

Vedclass · Answer

(C) For an astronomical telescope in normal adjustment,the final image is formed at infinity.The objective lens forms the image of a distant object at its focal point,which is at a distance $f_o$ from the objective lens.For the final image to be at infinity,this image must coincide with the focal point of the eyepiece.Therefore,the distance between the objective lens and the eyepiece is the sum of their focal lengths.Hence,the length of the telescope $L = f_o + f_e$.

The length of an astronomical telescope for normal vision (relaxed eye) ($f_o$ = focal length of objective lens and $f_e$ = focal length of eye lens) is

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