False. You can have total internal reflection where the effective angle is greater than 90 deg
It is not zero so the question is based on a false assumption.
false
true. and all things being equil(excuse me) the internal angles are all going to be 60degrees as we know that the internal angles of all triangles must add up to 180. see euclid. cheers.
True
false
False
True
False
false
false
False
false
True. Hunger is internal, a voice is external.
false
No, just the opposite.
true