If you want a magnification of “times 3″ in a telescope, and you have a lens of focal length 37 mm?
Tuesday, May 18th, 2010 at
1:43 am
If you want a magnification of "times 3" in a telescope, and you have a lens of focal length 37 mm to use as an eyepiece, what focal length do you need for an objective lens?
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M = (-si) / so
because in a telescope you want the object to be upright, M must be negative. Essentially giving you M = si/so.
3 = si/so
Then you have the lens equation of:
1/f = 1/si + 1/so
Just substitute the two equations into each other and solve for either si or so. Then plug it back in and solve for the other variable.