Compute the each part given question:
Question: A double convex lens has faces of radii 18.0 cm and 20.0 cm. When an object is placed 24.0 cm from the lens, a real image is formed 32.0 cm from the lens.
Part I: Determine the focal length of the lens.
Part II: Determine the index of refraction of the lens material.
I need expert help to solve the above question and thanks in advance.