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Old Dec 25th 2009, 01:08 PM   #1
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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
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Old Dec 27th 2009, 09:26 PM   #2
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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.
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Old Dec 31st 2009, 08:55 AM   #3
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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.
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Old Dec 31st 2009, 10:08 AM   #4
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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.
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Old Jan 2nd 2010, 08:18 PM   #5
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Galilean Telescope

The answer is 2.66 but your answer was 2.8
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