Physics Help Forum Physics Numerical (Galilean Telescope)

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 Dec 25th 2009, 01:08 PM #1 Junior Member   Join Date: Dec 2009 Posts: 3 Physics Numerical (Galilean Telescope) A Galilean telescope has an objective of 120 mm focal length and an eye piece of 50 mm focal length. If the image seen by the eye is 300 mm from the eye piece, what is the angular magnification? Please sovle this problem. [/B] Muneer Ahmed Karachi, Pakistan
 Dec 27th 2009, 09:26 PM #2 Senior Member   Join Date: Sep 2009 Location: india Posts: 409 now i know that galilean telescopes are complicated by use of a diverging lens as the eyepiece, but will that alter the fundamental working of an astronomical telescope? i mean, it will only make the final image erect. i will still stick the old thing with a plus sign ie. 120/50(1+50 /300)=2.8 please tell me about ur views.
 Dec 31st 2009, 08:55 AM #3 Junior Member   Join Date: Dec 2009 Posts: 3 Galilean Telescope I agreed with you, the image formed by eyepiece will be erect. I also got the same answer but the given answer is 2.66. Could you please write the details of the formula as you substitute the values but formula is not given.
 Dec 31st 2009, 10:08 AM #4 Senior Member   Join Date: Sep 2009 Location: india Posts: 409 f(objective)=fo f(eyepiece)=fe m=fo/fe * (1+fe/x) x=distance from eyepiece where final image is formed. but if the answer is not matching, i will think this again.
 Jan 2nd 2010, 08:18 PM #5 Junior Member   Join Date: Dec 2009 Posts: 3 Galilean Telescope The answer is 2.66 but your answer was 2.8

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