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प्रश्न
Distinguish between absolute refractive index and refractive index of a medium.
फरक स्पष्ट करा
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उत्तर
| Absolute Refractive Index | Refractive Index (Relative) | |
| 1. | The absolute refractive index of a medium is defined as the ratio of the speed of light in a vacuum to the speed of light in that medium. | The relative refractive index of medium 2 with respect to medium 1 is defined as the ratio of the speed of light in medium 1 to that in medium 2. |
| 2. | n = `c/v`, where c is the speed of light in a vacuum and v is the speed of light in the medium. | `""_1n_2 = v_1/v_2`, where v1 is the speed of light in medium 1 and v2 is the speed of light in medium 2. |
| 3. | It always uses vacuum (or air) as the reference medium. | It always uses vacuum (or air) as the reference medium. |
| 4. | The value of the absolute refractive index is always greater than or equal to 1. | The value of the relative refractive index can be greater than, less than, or equal to 1, depending on the pair of media. |
| 5. | It is also simply called refractive index when vacuum is the reference medium. | It is also called the relative refractive index, commonly used when studying the bending of light between two media. |
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