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Refraction of light
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If light hits glass at an angle of about 100 degrees, what happens? Will it be reflected, or refracted, and how?
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For more on marking an answer as the "Best Answer", please visit our FAQ.Some light will be reflected, and the remaining light which passes through the glass will be refracted as explained here
As kempie says, the angle of incidence can only be in the range 0 - 90�.
However, as an example, in my aquarium the sand/gravel substrate is 'illuminated' from the top surface down to about �" / 1.5cm-ish depth. This is irrespective of the total depth of the gravel, as the 'illumination' follows the contours.
This is due to internal reflection within the glass.