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Old Jan 19th 2010, 07:52 AM   #1
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Refraction Problem

I'm having trouble figuring out how to solve or even start this problem, can someone please help me?

A converging lens (f=25.0cm) is used to project an image of an object onto a screen. The object and the screen are 125 cm apart, and between them the lens can be placed at either of two locations. Find the two objects distances.

My only thought would be to maybe use the thin-lens equation 1/do + 1/di = 1/f to find the di, but then I'm not sure how that would help me find where the 2 lens are.
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Old Mar 1st 2010, 02:31 AM   #2
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Use the formula
1/f = 1/do + 1/di. It is given that (do + di ) = 125 m
so di = (125 - do).
substitute this in the lens formula and solve quadratic to find the two positions of the lens.
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Old May 13th 2010, 02:25 AM   #3
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Are the two spheres you're using the exact same size? If so that can cause problems. If I was you I'd use one sphere with two materials. Use an alpha with the second material (continents) and drag it onto the sphere so that the tag is to the right of the other texture tag.
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Old May 13th 2010, 04:57 AM   #4
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Originally Posted by Adara View Post
Are the two spheres you're using the exact same size? If so that can cause problems. If I was you I'd use one sphere with two materials. Use an alpha with the second material (continents) and drag it onto the sphere so that the tag is to the right of the other texture tag.
I think, you have answer different post. In this problem, there are no spheres.
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