Question

A person is standing at the edge of a pool 2.1 m deep. The pool is filled with water of index of refraction n = 1.33. Light traveling from an object at the bottom of the pool emerges from the water and travels to the person's eye. The light traveling in the air to the person's eye makes a  ϕ = 45° angle with the normal to the surface of the water. The person's eyes are 2.1 m above the ground. (y₁ = y₂ = 2.1 m)

Find the distance x of the object from the edge of the pool.