Light and Optics: Refraction!
When light passes from one material to another, the path of light must bend to the path of least time, or in other words, fastest route - this is what defines Refraction (bending).
The Law of Refraction is: Sin0i = nSin0r
What the law of refraction simply mean: Sin(angle of incident) = n(index) * Sin(angle of refraction)
We get the coefficient of n(index) through a separate equation, but it symbolizes that the speed of light will ALWAYS slow down when moving from air through another material.
In the example below we get to see REAL LIFE INVISIBILITY!!
Inside the test tube is oil, and inside the beaker is oil, but the bottom of the test tube is invisible!! This is because light does not need to bend that much or refract due to the similar indexes (alike substances). Because the beaker of oil has exactly the same index of refraction as the test tube of oil, the light will neither reflect nor refract between the test tube and beaker. Therefore the bottom of the test tube will appear to be invisible.
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