Lesson: Telescopes

In this lesson, we will learn how to calculate the imaging properties of reflecting, refracting, and compound optical systems used in telescopes.

Sample Question Videos

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Worksheet: 8 Questions • 2 Videos

Q1:

What is the angular magnification of a telescope that has a 100 cm-focal length objective and a 2.50 cm-focal length eyepiece?

Q2:

A 7.5x binocular produces an angular magnification of , acting like a telescope. (Mirrors are used to make the image upright.) If the binoculars have objective lenses with a 75.0-cm focal length, what is the focal length of the eyepiece lenses?

Q3:

A large reflecting telescope has an objective mirror with a radius of curvature of 10.0 m. What angular magnification does it produce when an eyepiece of focal length 3.00 m is used?

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