Your telescope has a 750 mm -focal-length objective and a 28 mm -focal-length ey
ID: 586013 • Letter: Y
Question
Your telescope has a 750 mm -focal-length objective and a 28 mm -focal-length eyepiece. One evening you decide to look at the full moon, which has an angular size of 0.52 when viewed with the naked eye.
PartA
What angle (in degrees) does the image of the moon subtend, when you look at it through your telescope?
Part B
Suppose you decide to take a photograph of the moon using your telescope. You position film so that it captures the image produced by the objective lens. What is the diameter of that image?
Explanation / Answer
given data
telescope has a 750 mm -focal-length objective
28 mm -focal-length eyepiece.
angular size of 0.52
A
= 0.52*750/28= 13.92°
B
D = f* = 750*(0.52*/180) = 2.166mm
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