Thank you to all who responded.  I learned alot about photo images and
scaling.

Original question:
I'm trying to print off a section at a scale of 1" = 20' so we can see
driveway accesses.  My photo gets too blurry at this scale so I'm wondering
1) is it possible to view and print at this scale and 2) am I just doing
something wrong.

I do not know what map units the photo should be in.  I have tried inches,
unknown and decimal units when importing it into a view.  Can someone help
with the details of the best way to import the image and manipulate it.  It
is a TIF file now, but I can use Photoshop to save to jpeg or other formats.

*********************
I have come to the conclusion that my photo does not have the resolution I
require, and below are some of the responses that I found very enlightening.

a) either the scan resolution (pixel size) of your photo is too coarse
or
b) you are not entering the representative fraction scale in the view
scale box.In other words, don't enter 1:20 because that is not the same as
1"=20'The representative fraction scale for 1"=20' is 1:240. Here's how I
got that:The units on each side of the colon need to be the same, so you
multiply 20 feet by 12 to get 240 inches. Similarly, 1"=100' becomes
1:1200 and so on.
********************************************
The important thing you need to find out is:  "how good is the original
photo?"
Aerial photo resolution is measured in pixels.  For example, we have a set
of photos that are 6" per pixel.  This means that 6 inches on the ground = 1
pixel on the photo.  So, features smaller that 6" across will not be
visible. A manhole cover at 3' across will be a bunch of squares that kind
of make a circle. This is fairly good quality, but if I zoom in too far all
I can see is the pixel aquares. You can't improve  the photo beyond the
pixel size- the information isn't there.  This has nothing to do with
ArcView, it's just the limitations of your picture.

Once you know the photo's properties, you can calculate good scales at which
to print.
*********************************
It is possible to print the air photo at that scale. However you will
need to know  several things about the air photo itself.
1 What is the scale of the photo. This can be easily calculated by
knowing the flying height and dividing it by the focal length of the
aerial camera. Is the scale of the photo sufficient to clearly visually
resolve the driveway accesses.

2. At what resolution was the photo scanned. For digital topographic
mapping, scanning is done at a 10 micron resolution. Which I think is in
the order of 4,000 to 5,000 dpi.
You may need to talk to a mapping company to be able to scan airphotos
at that resolution.