() If f is the focal length of a convex lens and an object is placed at a distance p from the lens, then its image will be at a distance q from the lens, where f, p, and q are related by the lens equation 1 1 1 f P q What is the rate of change of p with respect to q if q 5 m and f6 m? (Make sure you have the correct sign for the rate.) dp dq m/s