Can the relative refractive index of a medium w.r.t. another medium be less than unity?(a) Insufficient data(b) Indefinite(c) No(d) YesThe question was asked during an internship interview.I'd like to ask this question from Reflection of Light by Spherical Mirrors in section Ray Optics and Optical Instruments of Physics – Class 12

Can the relative refractive index of a medium w.r.t. another medium be

1.	Can the relative refractive index of a medium w.r.t. another medium be less than unity?(a) Insufficient data(b) Indefinite(c) No(d) YesThe question was asked during an internship interview.I'd like to ask this question from Reflection of Light by Spherical Mirrors in section Ray Optics and Optical Instruments of Physics – Class 12
Answer» Right CHOICE is (d) Yes To EXPLAIN: Yes. The refractive index of a medium concerning another medium can be less than UNITY. For example, the relative refractive index of WATER concerning glass is less than unity.

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