Theta equals 0 or pi.
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Every multiple of 180 degrees, beginning with zero.
'Theta' is a zero-looking Greek letter with a line across. It is used in physics and many mathematic equasions.
It means a central angle measured in radians. ex. Convert 360 degrees radians. 180 degrees = pi radians so 360 degrees = pi radians/180 degrees = 360pi radians/180 = 2 pi radians
Yes; if angle of incidence is zero angle of refraction is zero regardless of index: sin theta r = (n1/n2) sin theta i
It's called theta and it's a Greek letter.