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The angle of incidence would be 90 degrees, so the angle of refraction is 0 degrees, as the light ray does not deviate.
Inertia - or the absence of any force making it change direction.
The ball follows a parabolic path when thrown. In a vacuum (with no air or other forces acting upon it) the gravitational pull of the earth causes the ball to accelerate toward the earth (9.8m/sec
absolute path is an exact road to go in and path is just a relative path, for example the path is near the river - for a path and for an absolute path you can say the path is on green lake street on the intersection of green lake street and Burnside street.
optical path = μ x geometricalpath