θ 1 is the angle between the incident light beam and the surface normal.Snell's law is expressed as the following equation (see Figure 1 below for an illustration of the variables):Įquation 1: ![]() The beauty of this science project also lies in how you can verify one of the most basic laws of optics, experimentally, by using readily available and inexpensive materials. As you apply Snell's law and the definition of index of refraction in this science project, you will be able to measure the speed of light in gelatin. Snell's law compactly describes what happens to the trajectory of a beam of light as it passes from one medium, such as air, to another, such as glass. For example, before you answer the door and see your friend's face through the window, you see light that is refracted through the glass. ![]() The law of refraction, which is also known as Snell's law, actually applies to everyday life.
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