# OPTICS - Final tomorrow - Practice test help

1. Dec 13, 2007

### ChEJosh

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

2. Relevant equations

3. The attempt at a solution

(3) I haven't been able to start this one at all.

(6) I got part a (+45º P-state). I tried to do b and I got [1+i, -i+1] which isn't a polarization state, so I'm not sure what to do with c or if there is some way I can simplify it.

(7) Once again, I got part a. It's of the form E=$$E_{0}$$[$$\widehat{i}$$cos(kz-wt)+$$\widehat{j}$$sin(kz-wt)]
Does the cosine term drop out from the initial conditions?
For b, I'm not sure how to get the magnetic field equation. I know $$\overline{B}$$=($$\overline{K}$$$$\times$$$$\overline{E}$$)/$$\omega$$
But, I'm not sure how that helps me

Any help would be greatly appreciated!

2. Dec 13, 2007

### mgb_phys

3, sounds like it is describing a kepler telescope - a common design for a beam expander.
The two positive lenses are separated by the sum of their focal lengths.
The magnification is the ratio of the focal lengths.
A simple sketch shows you how it works.

3. Dec 13, 2007

### topherfox

What school do you go to, that paper and font, its exactly the same, is there some standard I don't know about?

4. Dec 13, 2007

### ChEJosh

WVU
And apparently, if you only have 3 characters in a message, it's "too short"