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I am learning about refraction and the million ways in which Snell's Law is presented to me is making me confused...

So, I understand that:

sin i / sin r, will give me the ratio of speeds c

_{i}/c

_{r}and λ

_{i}/λ

_{r}

However, I can't understand this form of:

n

_{1}sin i = n

_{2}sin r

How does it drop out?

Thanks,

Peter G.