Final answer:
The student's question deals with the application of Snell's Law in Physics to find unknown refractive indices, by utilizing provided values for refractive indices in air and water for various materials.
Step-by-step explanation:
The question pertains to the concept of refractive indices in Physics, specifically how they are used to describe the bending of light when it moves from one medium to another. This topic aligns with the study of optics, which is often covered in high school physics curricula. To solve problems related to the indices of refraction, we use Snell's Law, which relates the angles of incidence and refraction with the indices of refraction of the two media. In this case, the indices of refraction are given as n₁' = 1.5151 for glass in air and n₂' = 1.744 for N-LaF2 in water, with air and water having refractive indices of n₁ = 1 and n₂ = 1.333, respectively.