1. In an experiment to find the index of refraction, n, of a block of glass, the angle of incidence, θi, and angle of refraction, θr, were measured a number of times as follows:
θi: 10° 20° 30° 40° 50°
θr: 7.0° 13.5° 20.0° 25.5° 31.0°
Given that the relationship between n, θi and θr is...