Ray
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a zero degree angle. theres no other way to put it.
A zero degree angle is not the same as a 180 degree angle -- no more than a90 degree angle is the same as a 270 degree angle.It's not. An angle of zero is the same as an angle of 360 degrees. In fact, if you startwith any angle, and add or subtract 360 degrees from it, you wind up with the sameangle as the original one.
Yes; if angle of incidence is zero angle of refraction is zero regardless of index: sin theta r = (n1/n2) sin theta i
Zero.
An acute angle is between zero and ninety degrees.