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I have 3 questions 1) what power reading glasses are needed for a person whose near...

I have 3 questions
1) what power reading glasses are needed for a person whose near point is 144cm, so that he can read a computer screen at 54cm? Assume a lens-eye distance of 1.8cm
2) the overall magnification of an astronomical telescope is desired to be 25x if an object of 84cm focal length is used, what must be the focal length of the eyepiece?
3) the overall magnification of an astronomical telescope is desired to be 25x if an object of 78cm focal length is used, what is the overall length of the telescope when adjusted to be used by the relaxed eye?
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