Question

Difference between snell's law and refractive index

Answer 1

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n2 > n1. Since the velocity is lower in the second medium (v2 < v1), the angle of refraction θ2 is less than the angle of incidence θ1; that is, the ray in the higher-indexmedium is closer to the normal.
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Answer 2

Acording to snell'law,the ratio of sin i and sin r still remain constant until median didn't became change .

aa and refrective index is the ratio of speed of light in vaccum and speed of light in the given median