# Homework Help: Real 3D Image produced by concave lens

1. Aug 10, 2013

### Knightycloud

1. The problem statement, all variables and given/known data
Find the correct image produced by the concave lens. F is focal length.

2. Relevant equations
If an object is placed between F and 2F, the image will be inverted, real, larger and beyond 2F.

3. The attempt at a solution
I choose the answer A. Is it correct?

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• ###### Lense Ans.JPG
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2. Aug 12, 2013

### Basic_Physics

Use a ray diagram to resolve this problem. The arrow head of the object is closer to the lens.

3. Aug 12, 2013

### Knightycloud

Thanks, the answer is B. I marked it wrong anyway! :/

4. Aug 13, 2013

### Basic_Physics

My ray diagram suggests neither are correct?

5. Aug 13, 2013

### Knightycloud

Sorry, I think the image makes a little fuzzy. That arrow curve is perpendicular to the axis. In this image it looks it's headed towards i see.

6. Aug 14, 2013

### Basic_Physics

The image is smaller, upright and virtual.

#### Attached Files:

• ###### concave lens ray diagram.jpg
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7. Aug 15, 2013

### Knightycloud

My bad. It's a convex lens :( Sorry, now only noticed.
I think now you can get it correct. Thanks for the support. :) It was in my exam paper and I chose the wrong one anyway! :(