An astronomical telescope uses an objective lens of focal length?
Wednesday, April 28th, 2010 at
5:42 pm
An astronomical telescope uses an objective lens of focal length 15m and eye lens of focal length 1cm. What is angular magnification of the telescope?If this telescope is used to view Moon, what is diameter of the image of Moon formed by the objective lens?
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The magnification is the ratio of the two focal lengths:
http://ifa.hawaii.edu/~barnes/ASTR110L_S03/basicscopes.html
http://en.wikipedia.org/wiki/Optical_telescope