A flashlight is placed at the bottom of an empty swimming pool a distance L = 1.5 m from a wall of the pool (Fig. P24.36). Light from the flashlight just grazes the corner of the pool and travels along ray 1, which strikes a vertical pole at a height h₁ = 2.0 m. The pool is filled with an unknown transparent liquid, and light from the flashlight then follows ray 2, which strikes the pole at h₂ = 1.4 m. Find the index of refraction of the liquid.