Optical fibres travel at 2x10 to the 8m/s
They are cheaper and carry more signals than copper wires
Refraction is when the angle of incidence is less than the critical angle and so passes out the bottom of the glass. A small amount is reflected.
The critical angle- if the angle of incidence equals the critical angle the ray will emerge along the edge of the glass block.
Reflection is when the angle of incidence is greater than the critical angle and is totally internally reflected.
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