A zero degree angle is not the same as a 180 degree angle -- no more than a
90 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 start
with any angle, and add or subtract 360 degrees from it, you wind up with the same
angle as the original one.
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a zero degree angle. theres no other way to put it.
No. They form an angle.
Yes; if angle of incidence is zero angle of refraction is zero regardless of index: sin theta r = (n1/n2) sin theta i
That would depend on the angle. Any positive number up to and including 360 is possible. (I don't think you can have a zero degree angle.)
Draw a straight line and place zero degrees of the protractor at the endpoint of the line then mark out 135 degrees and join the endpoint with the marked out degrees to construct the required angle.