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1What is the angle of incidence?Angle between the normal and the incident ray.
2What is the angle of reflection?The angle between the reflected ray and the normal (the imaginary line drawn at 90 degrees to the reflecting surface).
3What is total internal reflection?Complete reflection of a light ray reaching a boundary greater than the critical angle.
4When does total internal reflection occur?Total internal reflection occurs when the angle of incidence is beyond the critical angle. It does not happen when the angle is the same.
5What is the term that describes the changing direction of light when it changes medium?Refraction is the term that describes the changing direction of light when it changes medium. This occurs when light moves from air to glass.
6Why does refraction occur?Refraction occurs when light rays change speed as they enter a medium with a different density.