# Producing images with telescopes

1. Jun 14, 2010

### element41\$

1. The problem statement, all variables and given/known data
A telescope has a mirror with a focal length of +3 meters and the distance from the mirror the the eyepiece is 3.5 meter. If the eyepiece is 3.5 meter.

a. If the eye piece has a focal length of 50 cm, where would the image produced by the eyepiece be? Could the image be projected on a screen at that location?

b. this is the case for astronomical telescopes, so how do you get an image when you look in the eyepiece? {hint: If you use a digital camera with no lens, you must reposition the eyepiece with the focus knob.}

2. Relevant equations
n/a

3. The attempt at a solution
this is what i got:

a. The image would be produced at the eyepieces focal length. so 0.5m from the eyepiece. Yes this image could be projected on a screen at this location.

b.With astronomical telescopes we can see a image while looking into the eyepiece because we can adjust the eyepieces focal length until it is clear to our eyes.

Thank you
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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