# Lenses/telescope

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Hi. Can someone please show me how to do the following problem? Thank you.

"The Moon has an angular size of 0.50° when viewed with unaided vision from Earth. Suppose the Moon is viewed through a telescope with an objective whose focal length is 51 cm and an eyepiece whose focal length is 51 mm. What is the angular size of the Moon as seen through this telescope?"

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##### Solution Summary

The solution includes calculations to find the angular size of the moon as seen through a telescope.

##### Solution Preview

First we know that the angular magnification of the telescope M is given by:

M = theta' / ...

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