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in this video were going to go over the law of reflection and the law of refraction so lets say if this line represents the boundary between two materials above we have air and lets say below is glass and this vertical line which is perpendicular to the surface it forms a 90 degree angle with the surface this is called the normal line and lets say if we have a light ray that is incident on this boundary the incident ray is the ray that strikes the glass and this is called the reflected ray i gotta make it equal so this angle between the incident ray and the normal line this is called the angle of incidence this angle between the normal line and the reflected ray thats the angle of reflection the law of reflection states that the angle of incidence is equal to the angle of reflection so if the angle of incidence is 30 degrees the angle of reflection will also be 30 degrees thats the law of reflection refraction is the process where light bends as it passes through the air glass b
