The rate of sine of the angle of incidence to the angle of refraction (r) is a constant called refractive index
i.e.
.
For two media, Snell's law an be written as ![893_Snells law1.png](https://www.expertsmind.com/../CMSImages/893_Snells law1.png)
When a light wave goes from a rarer phase to a denser medium, it bends towards the normal.
![1236_Snells law2.png](https://www.expertsmind.com/../CMSImages/1236_Snells law2.png)
When a light wave goes from a denser medium to a rarer medium, it bends away from the normal.
![2423_Snells law3.png](https://www.expertsmind.com/CMSImages/2423_Snells%20law3.png)
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