Compare the angle of incidence with the angle of refraction when a light ray leaves glass and enters air?

Question

light ray leaves glass and enters air at a non-zero angle?

Answer 1

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Answer 2

The angles of incidence and refraction for a ray going from glass to air are the same, respectively, as the angles of refraction and incidence of a ray going from air to glass. (Thus a ray passing from air through a flat glass plate to air continues on a path parallel to its initial path.) The general law (Snell's law) describing the incident and refracted angle relationships is
Ni * sine(theta(i)) = Nr * sine(theta(r)), where N is the index of refraction and i and r denote incident and refracted rays respectively. N(air) is very close to 1. Since glass is available in a range of N values, I won't give numeric examples, but you can see one in the ref.

Answer 3

they are equivalent each time mild enters some textile after which re-enters the unique textile, it refracts returned into the unique textile on the comparable attitude that it entered.