Reflection and refraction affect the path of light from "summary" of Fundamentals of Physics, Volume 1 (Chapters 1 - 20) by David Halliday,Robert Resnick,Jearl Walker
When light encounters a boundary between two different mediums, such as air and glass, it can change direction. This phenomenon is known as refraction. Refraction occurs because the speed of light is different in each medium, causing the light rays to bend as they pass from one medium to another. The amount of bending that occurs during refraction depends on the difference in the speed of light between the two mediums. If the speed of light is greater in the second medium, the light will bend towards the normal line - an imaginary line perpendicular to the boundary. Conversely, if the speed of light is less in the second medium, the light will bend away from the normal line. In addition to refraction, light can also change direction wh...
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