Glass doesn't reflect light as much as it REFRACTS it. Remember the glass prism with the rainbow? That works by shooting a ray of light through one angled side and seeing the seven different wavelengths of light at there different frequencies refract. The greater the angle of the ray entering the glass, the greater the level of refraction, hence the index of refraction. Basically, YES lasers will work on glass in the same way that light does, but can still have a small margin of error due to refraction. That is almost incalculabel to any relavent degree. Sorry for the rambling...hope that helped some.
P.S. I WAS a physics major specializing in light and optics before choosing my present career path.
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