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2.8 Exercise 59

Avg difficulty 2.5

An unknown planet at a distance of 1012m10^{12} \text{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 m. If the far away planet is seen to subtend an angle of 10−5radian10^{−5} \text{radian} at the eyepiece, what is the size of the planet?

OpenStax University Physics Volume 3, 2.8 Microscopes and Telescopes, exercise 59

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Adapted from University Physics Volume 3 © 2016 Rice University. Licensed under CC BY 4.0. Source: University Physics Volume 3. Imported at revision db44eb9.