Refraction of light

[jamesy boy]

If light hits glass at an angle of about 100 degrees, what happens? Will it be reflected, or refracted, and how?

[kempie]

Some light will be reflected, and the remaining light which passes through the glass will be refracted as explained here

[kempie]

I presume that by 100� you mean 10� off normal (i.e 90�).

[brachiopod]

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.