Angular seperation between diff wavelengths

[Dx]

A ray of light consists of blue light(480nm wavelength) and red light(670nm wavelength) is incident on a think piece of glass at 80 degrees. what is the angular seperation between the refracted red and blue beams while they are in glass? (The respective indices of refraction for the blue light and red light are 1.4636 and 1.4561)

What in the hell do I do? [g)]

I have got no clue what to do here, plz help. Lost soul here with lots of determination to learn without using alot of math. HEHEHE![:D]
Any help would be appreciated!
Thanks!
Dx [;)]

[Tom Mattson]

Just treat it as two different problems. If you have monochromatic light incident on a surface at an angle θi, how do you calculate the angle of refraction θr? Do that for both cases, and subtract the two angles to find the angular separation.