EE 119
Homework 6
Professor: Jeff Bokor
TA: Xi Luo
Due Tuesday, March 9
th
2010
(Please submit your answers in EE119 homework box located in 240 Cory Hall)
1. Captain James Cook is sailing through the south pacific on a mission from the
Royal society to observe the passage of Venus across the sun. He has a telescope
with him, but he doesn’t know how good it is, so he brings you along to help him
figure it out. The eyepiece of the telescope is 2 cm in diameter and has a focal
length of 4 cm. The clear aperture of the exit pupil is 0.35 cm. The telescope has an
angular magnification of 45. Assume normal visual acuity, which means that the
spacing between the cone cells in the eye of the viewer is 0.3 milliradians.
(a)
What is the focal length of the objective lens?
(b)
What is the diameter of the objective lens?
(c)
What is the object field angle? The object field angle is the maximum angle that
defines the field of view of the telescope due to the diameter of the eyepiece
lens (and not to diffraction).
(d)
What is the image field angle?
(e)
Is the telescope diffractionlimited? Why or why not?
(f) Captain Cook sees a ship in the distance, and he wants you to tell him if the ship
is a pirate ship or a friendly merchant ship. The black flag of the ship has white
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 Spring '09
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