A quick question about refraction: does a wave's wavelength have any effect on how much it refracts when going from one medium to another?

I ask because I'm currently revising for a physics exam and unless this is the case I've no idea whatsoever why it is that the colours you see in a soap bubble change depending on the angle from which you're viewing it.

Yes the wavelength affects the amount of refraction.

Shorter Wavelengths (blues and purples) refract more than longer ones (reds and yellows).
Oh George... Oh George.

That Texas education must've fucked you up when you very small.

Too true, Roger. Too True.
yes wavelength does affect refraction. in fact snell's law can be expressed as sin A / sin B = wavelength A / wavelength B. The soap bubble is actually due to destructive / constructive interference that occurs due to the change of phase when light is reflected from a surface. You can try googling thin film interference. The link gives a pretty good explanation http://physics.bu.edu/py106/notes/Thinfilm.html . Anyway this also explains for the antireflection coating that you so often hear of in glasses or camera lenses.