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Solved: In 76, an eyepiece is selected to give the Moon an

Chapter 27, Problem 77P

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QUESTION:

Problem 77P

In Problem 76, an eyepiece is selected to give the Moon an angular size of 15°. What is the focal length of this eyepiece?

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QUESTION:

Problem 77P

In Problem 76, an eyepiece is selected to give the Moon an angular size of 15°. What is the focal length of this eyepiece?

ANSWER:

Step 1 of 3

Here we need to determine the focal length of the eyepiece of telescope. The angular size of Moon is given to be  and the eyepiece gives to the Moon angular size .

Let the magnification of the telescope be , and the telescope has the focal lengths of the eyepiece and objective lens are  and  respectively.

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