Yep - and it's a good thing when it happens because light travelling at a significant angle from the axis travels a great distance and causes greater multipath dispersion.
You can say all the light coming out of the far end of a fibre didn't get refracted - but certainly not all of the light going into the fibre comes out the other end and the missing light isn't all absorbed in the glass.
You can say all the light coming out of the far end of a fibre didn't get refracted - but certainly not all of the light going into the fibre comes out the other end and the missing light isn't all absorbed in the glass.
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