The slope is 1.01 and the intercept is approximately 0 (-6.03E-3). The relationship between the angles should be that they are either equal or very close in value. According to Snell’s law the sines of the angles should only differ by the two different indices of refraction. One index being air (1) and the other index should be very close to 1 as the difference between the values of sin incident and refraction should be the other index of reflection.
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