I have some questions regarding refraction because it has been a long time since I touched on it and it is going to be on my Physics quiz!
Thank you for your time!1-If a beam of light goes from air to another substance, will it slow down? or speed up?
2-If it speeds up, does that mean that the angle of refraction is going to be smaller than the incident? If it slows down, would the angle be bigger than the incident?
3- Do you measure the angle of incident and refraction from the normal (vertical line perpendicular tot he surface) or from the horizontal surface?