- #1

Fabon

- 14

- 1

Hey everybody,

I'm right now trying to solve a question I found in a German physics competition 2006 concerning the diameter of a thin camera lens. I'm not able to find a solution, since there is basically nothing given.

Here the task (I underlined phrases which might be important):

The only given value is the diameter of the unclear circles caused by the small lamps (by using the ruler on the photo). I know some laws and how to make these "ray diagrams" with lines, but I have no Idea how to solve this task and what is needed, especially since I have never seen a formula (or so) that includes the diameter.

I hope you can help me finding a solution.

I'm right now trying to solve a question I found in a German physics competition 2006 concerning the diameter of a thin camera lens. I'm not able to find a solution, since there is basically nothing given.

Here the task (I underlined phrases which might be important):

*A ruler was photographed. There was a chain of lights with*

Find the

__small__lamps paced__far__behind the ruler, so that the lamp occur to unclear. You are allowed to assume, that the picture was taken by a single,__very thin__lens.Find the

__diameter__of the lens by using the photo.The only given value is the diameter of the unclear circles caused by the small lamps (by using the ruler on the photo). I know some laws and how to make these "ray diagrams" with lines, but I have no Idea how to solve this task and what is needed, especially since I have never seen a formula (or so) that includes the diameter.

I hope you can help me finding a solution.