# Homework Help: Lens and focal point

1. Aug 15, 2008

### Gear2d

1. The problem statement, all variables and given/known data
I have a two lens system (both are convex lens; converging lens). Say I set lens 1 on left hand side and lens 2 on the right hand side.

A)If I place an object within the focal point of lens 1 and the image create by this lens is OUTside the focal distance of lens 2, what type of image will be formed?

B) Now the same as part "A" but this time the image formed by lens 1 is inside the focal distance of lens 2, what type of image is formed?

2. Relevant equations

3. The attempt at a solution

A) Lens 1 will form a virtual upright image (since object is in the focal point of lens 1). Now this image becomes the "oject" of lens 2. Since it falls outside lens 2's focal distance the image formed will be real and inverted?

B) Same as Part "A" up until we get to lens 2. Now this time its in the focal distance of lens 2, so the object, which is virtual upright, will become real and upright?

2. Aug 16, 2008

### alphysicist

Hi Gear2d,

That sounds right to me.

What is your reasoning for this result?