What is the tube length of a telescope?

  • A
    The distance between the objective lens and the eyepiece.
  • B
    The distance between the focal point of the objective and the focal point of the eyepiece.
  • C
    The sum of the focal lengths of the objective and the eyepiece.
  • D
    The distance between the objective lens and the image formed by it.

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Similar Questions

The focal length of the objective and the eyepiece of a telescope are $100\, cm$ and $5\, cm$ respectively. If the final image is formed at the least distance of distinct vision,the magnification of the telescope is:

The astronomical telescope consists of an objective lens and an eye-piece. The focal length of the objective is:

The magnifying power of an astronomical telescope for normal adjustment is given by:

To increase the magnifying power of a telescope ($f_o$ = focal length of the objective and $f_e$ = focal length of the eye lens):

In an astronomical telescope in normal adjustment,a straight black line of length $L$ is drawn on the inside part of the objective lens. The eyepiece forms a real image of this line. The length of this image is $I$. The magnification of the telescope is

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