Question
You can determine the index of refraction of a substance by determining its critical angle. (a) What is the index of refraction of a substance that has a critical angle of $68.4^\circ$ when submerged in water? What is the substance, based on Table 25.1? (b) What would the critical angle be for this substance in air?
1. $n = 1.43$. This is fluorite.
2. $44.2^\circ$
Solution Video