Things that are likely to come up:
Page #1, Optics, Snell's law? (Sine I/ sine r = c/v or something)
G491
#2, Pixel Count and CCDs, to do with the smallest resolution suitable for the CCD and suitable size for pixel count? (pixels not smaller than the diffraction limit)
G491
#3, Atomic level diffraction patterns, Wavelength=d sine theta = dx/L
G492
#3, Speed of electrons that boil off the surface? 1/2mv^2 , and how 'high energy electrons' (high freq) change diffraction patterns?
#4 More CCD/ Pixel things (Just revise this, bits and bytes etc)
G491
Just generally how the Scanning Electro Microscope and Transmission Electron Microscope work
(Mag field to focus electrons into a beam, Elec field to steer the beam)
I'll add more links later
Good luck!
Stay toasty