Physics quiz question: telescope objective lens image

Physics 205B Quiz 2, Fall Semester 2010
Cuesta College, San Luis Obispo, CA

Cf. Giambattista/Richardson/Richardson, Physics, 2/e, Multiple-Choice Question 24.1

The objective lens of a telescope produces a:
(A) real image between the objective lens and eyepiece lens.
(B) real image in front of the objective lens.
(C) virtual image between the objective lens and eyepiece lens.
(D) virtual image in front of the objective lens.

Correct answer: (A)

The objective lens of a telescope, for an object at infinity, produces a real (inverted) image at its primary focal point, which will be located between the objective lens and the eyepiece lens.

Student responses
Section 70856
(A) : 9 students
(B) : 1 student
(C) : 0 students
(D) : 1 student

Success level: 82%
Discrimination index (Aubrecht & Aubrecht, 1983): 0.40