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The mid-term exam for the PHYS 355: Optics course, held in Fall 2007. The exam covers various topics related to lens systems, including calculating the focal length and position of principal planes, determining which lens faces long-distant objects, minimizing spherical aberration, and understanding magnification. Students are required to use provided lens characteristics and solve problems using given equations.
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Mid-Term Exam 2 – PHYS 355 - OPTICS
Mendes, Fall 2007, Oct 30, 2007
Start time: 9:30 a.m.,
End time: 10:45 am
Open textbook, notes, homeworks, and quizzes
Calculators allowed; no other electronic device allowed
Where it is appropriate, make sure to provide physical units to your numerical answer
Lens A:
Lens B:
Your goal is to construct a Keplerian refracting telescope with this pair of lenses:
a) (10 points) Calculate the focal length and position of the principal planes of lens A:
b) (10 points) Calculate the focal length and position of the principal planes of lens B:
c) (5 points) Which lens (A or B) should face long-distant objects (moon, stars, etc).
d) (15 points) As we know, in order to minimize spherical aberration, the flat surface of a spherical lens should typically face the long(er) conjugate. With that in mind: i) sketch the telescope by showing the proper sequence and orientation of the lenses (don’t forget to show which direction the light beam is propagating) and ii) calculate the correct distance between the vertices of the two lenses and show it in your drawing.
e) (5 points) What will be the magnifying power of this telescope? What does it mean?
f) (5 points) Will the image be inverted or erect for this telescope?
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