As a student in the lab, I was tasked to find the refractive index of a mystery material. I measured the angle of incidence in air θ₁ = 240 and the angle of refraction in the mystery material to be θ₂ = 130. Based on the quantities I measured, what is the index of refraction of the mystery material? The index of refraction of air is n = 1. Round your answer to the nearest whole number.