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| Q.72 | Refractive Index of a material is defined as: | |
| Ans | 1. amount of energy reflected by the material to the total amount of energy supplied. | |
| 2. amount of light reflected by the material to the total amount of light impinged. | ||
| 3. velocity of light in vacuum to that within that material. | ||
| 4. velocity of sound in vacuum to that within that material. |
Correct Ans Provided: 3
