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5th January 2003 Refracting telescope The telescope is also a compound lens system. In this case, we want to see objects, which are very far away, so one of the lenses will necessarily have a very large focal length. This contrasts with the microscope, which has a short focal length for the objective lens in order to see something very close. For the telescope, the intermediate image produced by the objective lens has a size where is the focal length of the objective lens and is the angular size of the source. The eyepiece then acts the same as for the microscope; it takes the intermediate image as its object and magnifies it to a final angular size . Thus, the angular magnification of the telescope is Where is the focal length of the eyepiece and that of the objective? Note that the dependence of on and is different; here...

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