Physics · Light - Reflection and Refraction
The refractive index of a second medium with respect to the first medium, denoted as n21, is given by which of the following relations (where v1 and v2 are the speeds of light in medium 1 and medium 2 respectively)?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Ratio of speed in first medium to second medium: v1 / v2✓
- 2Ratio of speed in second medium to first medium: v2 / v1
- 3Sum of the speeds: v1 + v2
- 4Product of the speeds: v1 × v2
Correct answer
Ratio of speed in first medium to second medium: v1 / v2
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