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Old Sep 6th 2009, 09:44 PM   #1
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Lens on filament?

A diverging lens with focus 5 cm is placed in a filament. Find the distance between the lens and the filament.

I use formula : $\displaystyle \frac{1}{f}=\frac{1}{di}+\frac{1}{do}$

I think the question is asking about do = distance of the object. But I don't know di (distance of image). How to solve this problem?

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Old Sep 7th 2009, 10:15 PM   #2
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Please check your question again. If the lens is in the filament, how can there be a distance between them?
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Old Sep 8th 2009, 04:50 AM   #3
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Hi physicsquest

The original question is "A diverging lens with focus 5 cm is placed on a filament. Find the distance between the lens and the filament."

But it also can be interpreted that there is no distance between the filament and the lens. So I think maybe the lens is placed in a bulb with a distance from the bulb filament. But I'm not sure.

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