EE119 Discussion Section 5
(03/01/10)
Professor: Jeff Bokor
TA: Xi Luo
1.
Telescope
An objective of an astronomical telescope has a diameter of 12.5cm and focal
length of 85.5cm. When it is used with an eyepiece having a focal length of 2.5cm
and a diameter of 1.5cm, what will be
a)
the angular magnification,
b)
the diameter of the exit pupil,
c)
the object field angle,
d)
the image field angle, and
e)
the distance between the eyepiece and your eye.
Design an astronomical telescope which can resolve an object on the moon which
is 1/50 the size of the moon (the moon is 3476km in diameter and orbits at
roughly 384,300 km from the earth). Assume normal visual acuity and the
diameter of the iris of the eye to be 4mm. Make sure the telescope is not
diffraction limited. Show your design flow; a ray trace of the system; focal lengths
of the lenses; sizes of the aperture stop, entrance pupil, and exit pupil; all pertinent
distances. You may use two lenses with any power and any size you desire, but
make the telescope as compact as you can
.
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 Spring '09
 Telescope, Fnumber

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