railway RRB Technician Grade 3 Mock Test 2024 General Science Physics Wave

How is the refractive index of a material related to the speed of light in air?

1
Refractive index = Speed of light in air x Speed of light in material
2
Refractive index = Speed of light in material/ Speed of light in air
3
Refractive index = Speed of light in air/Speed of light in material
4
Refractive index = Speed of light in air +Speed of light in material

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