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Arrive at Snell's law of refraction, usi...

Arrive at Snell's law of refraction, using Huygen's principle for refraction of a plane wave.

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In `DeltaABC`, `sini=(BC)/(AC)=(v_(1)t)/(AC)`
and in `DeltaAEC` , `sinr=(AE)/(AC)=(v_(2)t)/(AC)`
`(sini)/(sinr)=((v_(1)t//AC)/(v_(2)t//AC))`
`=(v_(1))/(v_(2))=` constant = (relative) refractive index
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