# Optics and Cameras

1. Jul 30, 2008

### poweroffive

1. The problem statement, all variables and given/known data

Why does a camera get wider/longer?

2. Relevant equations

N/A

3. The attempt at a solution

Well, I assume that it is to produce the largest image that can possibly be on the film. But I'm a little confused on the question as a whole? Am I on the right track and what can I add on to what I think thus far?

2. Jul 30, 2008

### mgb_phys

It'sa little confusing, can you post the complete question?

3. Jul 30, 2008

### poweroffive

If it is desirable to produce the large image, then why does the camera get wider/longer?

I agree, I'm not sure what the question is exactly asking! Thanks for your help thus far!

4. Jul 30, 2008

### mgb_phys

Not sure what it's asking but:
To make a large image you want a large negative, the minimum detail siaze on a film (or a CCD) is a fixed sizeso to get more detail/pixels you need bigger film (or CCD).

In a perfect camera you are limited by diffraction, the larger the lens the less the effect of diffraction