A ray of light moves from one medium having a refractive index of μ1 to another medium having a refractive index of μ2. If the angle of incidence is i and the angle of refraction is r, then the value of \(\rm {{sin \,i} \over sin \,r}\) is:
1
μ1
2
μ2
3
μ1/μ2
4
μ2/μ1
5
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