Final answer:
To convert R.I. measured at one temperature to another, convert temperatures to Kelvin using the formula TK = Tc + 273.15, then use the material's thermo-optic coefficient to adjust the R.I. for the temperature difference.
Step-by-step explanation:
To convert the refractive index (R.I.) measured at the observed temperature (Tobs) to another specified temperature (T1), you would typically use a temperature correction equation. First, you need to convert both temperatures to the Kelvin scale. The equation to convert degrees Celsius to Kelvin is: TK = Tc + 273.15.
Once you have converted the observed temperature and the desired temperature to Kelvin, you will then rearrange the equation algebraically to solve for the new R.I. at T1. This process involves accounting for the change in the refractive index with temperature, which is based on the material's thermo-optic coefficient.
It's important to note that the specific equation used for the conversion can vary depending on the substance and the precise conditions, so it is essential to use the appropriate equation for the material in question. In general, though, the conversion involves adjusting for the difference in temperature between Tobs and T1.