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
Worksheet: 8 Questions • 2 Videos
Two stars that are km apart are viewed by a telescope and found to be separated by an angle of radians . If the eyepiece of the telescope has a focal length of 1.5 cm and the objective has a focal length of 3 meters, how far away are the stars from the observer?
What is the minimum angular spread of the beam produced?
Neglecting atmospheric effects, find the size of the spot this beam would make on the Moon. Use a value of m for the distance to the Moon.
In a reflecting telescope, the objective is a concave mirror of radius of curvature 4.0 m and the eyepiece is a convex lens of focal length 6.0 cm. Find the apparent size of a 5.0 m tree at 20 km that you would perceive when looking through the telescope.