Astronomy current events question: Large Binocular Telescope adaptive optics

Astronomy 210L, spring semester 2012
Cuesta College, San Luis Obispo, CA

Students are assigned to read online articles on current astronomy events, and take a short current events quiz during the first 10 minutes of lab. (This motivates students to show up promptly to lab, as the time cut-off for the quiz is strictly enforced!)

Camille Carlisle, "Twin-Eyed Telescope Sees Sharp Stars," March 21, 2012
http://www.skyandtelescope.com/news/home/Bino-Telescope-Sees-Sharp-Stars-143650876.html

The Large Binocular Telescope in Arizona uses many tiny magnets to continually deform its optics in order to:
(A) refocus on rapidly moving objects.
(B) capture three-dimensional image movies.
(C) prevent dust build up.
(D) filter out infrared interference.
(E) counteract atmosphere blurring.

Correct answer: (E)

Student responses
Sections 30678, 30679, 30680
(A) : 11 students
(B) : 4 students
(C) : 1 student
(D) : 9 students
(E) : 25 students