- #1

Aelo

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## Homework Statement

An 80 mm focal length thin lens is used to image an object with a magnification of -1/2.

The lens diameter is 25 mm and a stop of diameter 20 mm is located 40 mm in front of the lens.

How big is the unvignetted field of view [in terms of object size (in mm) and in terms of half field angle]?

How big is the fully vignetted field of view?

## Homework Equations

Magnification = l'/l (coupling this with the focal length, we can find the object and image distances)

Vignetting equations attached

## The Attempt at a Solution

I've drawn a picture and looked at http://spie.org/x32310.xml. I found that l' = -240 mm and l = 120 mm. I'm not sure where to go from here. Thanks in advance for help!