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## Homework Statement

Two lenses with the focal length of 50 mm are placed tightly. An object is placed 130 mm away from the lenses. Where is the image generated by the lenses?

## Homework Equations

[tex] \frac{1}{a}+\frac{1}{b}=\frac{1}{f} [/tex]

[tex] L = f_{ocular} + f_{objective}[/tex]

## The Attempt at a Solution

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Frankly, I tried starting out by simply using the first equation. I got b to around 81 mm to the right.

I don't know if it's correct. The question never specifies which type of lens (convex or concave). Doesn't specify which kind of optical setup (meaning I don't know if to use the second equation). I thought about dividing the problem with respect to each lens but I don't know the kind of lenses used so I have no clue.