snell's law

Question

Snell's law at interface n1, n2 is:

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**Snell's Law** describes how light bends when crossing from one transparent medium to another:
$n_1 \sin 	heta_1 = n_2 \sin 	heta_2$
- $n_1, n_2$ are the absolute refractive indices of the media.
- $	heta_1$ is the angle of incidence and $	heta_2$ is the angle of refraction.
- When light enters a denser medium ($n_2 > n_1$), it bends **towards** the normal ($	heta_2 < 	heta_1$).

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Snell's law for refraction is n1 sinθ1 = n2 sinθ2. It arises from conservation of?