Archive for June, 2010

true or false? A reflecting telescope uses convex lenses to gather and focus light.?

Sunday, June 6th, 2010 at 3:15 pm

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How do I calculate the sun’s diameter using a telescope?

Friday, June 4th, 2010 at 12:27 am

Comments (2)

For my open Physics lab, I'm observing the sun using a sun projection method. One of the things I need to do is project the image of the sun onto a screen and from this calculate its diameter. So I have the size of the image, its distance from the eyepiece, the eyepiece's diameter, etc. Basically I'm looking for some help deriving the formula to get the size of the object being projected, when there's two lenses involved in the telescope, the eyepiece and the telescope lens. Any help would be appreciated.