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3 cards from this section. Quick, good the night before a test.
What is the purpose of a telescope?
Think about distant stars and planets.
Name the two main components of a telescope.
One gathers light, and the other helps us see it.
What is the magnifying power if the objective focal length is 100 cm and the eyepiece focal length is 20 cm?
Use the focal lengths in the formula.
True or False: A longer focal length in a telescope generally means lower magnifying power.
Think about how focal length affects magnification.
If a telescope's objective lens has a focal length of 250 cm and the eyepiece has 5 cm, what is its magnifying power? Discuss how this affects observations of faint stars.
Use M = f_o / f_e to find magnifying power.
Imagine an astronomer has a telescope with a focal length of 180 cm for the objective and is using a 15 cm eyepiece. If they change to an eyepiece of 30 cm, how will the magnifying power change?
Remember the formula for magnifying power.
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