Refractive index (n) = Speed of light in vacuum (c) / Speed of light in medium (v). Relative refractive index (n₂₁) = Speed of light in medium 1 (v₁) / Speed of light in medium 2 (v₂). A higher refractive index indicates a slower speed of light in the medium.
Find the refractive index of the second medium with respect to the first medium, if light moves through the first medium with velocity 2 × 10⁸ ms⁻¹, which changes to 1.25 × 10⁸ ms⁻¹ in the second medium.
Asked in MPSC CS Prelims 2021 · Topic: Optics (Reflection and Refraction at plane and spherical surfaces)
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