Lesson: Telescopes

Investigate the imaging properties of the reflecting, refracting, and compound optical systems used in telescopes.

Worksheet: Telescopes • 4 Questions

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

Q3:

A planet at a distance of m from Earth is observed by a telescope that has a focal length of the eyepiece of 1 cm and a focal length of the objective of 1 cm. The planet is seen to subtend an angle of rad at the eyepiece. What is the size of the planet?

Q4:

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?

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