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January 27, 2015

January 27, 2015

Posted by **ceasar3** on Tuesday, December 6, 2011 at 5:25am.

- physics -
**drwls**, Tuesday, December 6, 2011 at 7:42amI have some issues with that question, and am not going to answer it they way they want.

It is much comfortable to have the objective image at the focal point of the eyepiece, so that the eye sees an image at infinity. In that case, the magnification of the telescope is obtained from the formula

M = f(obj)/f(eyepiece)

which equals 16, in this case. That is not much of a telescope. A true astronomical telescope will have a longer objective focus longer than 80 cm and an eyepiece with a shorter focal length than 5 cm, unless you are just using binoculars.

- maths -
**chrystabelle1**, Tuesday, December 6, 2011 at 8:34amIf y=e(power x)+ e(power-x)/2. find x when y=1

- Note to chrystabelle -
**drwls**, Tuesday, December 6, 2011 at 10:29amPost that as a separate question, with subject math

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