An object 5 cm high is located 75 cm from a converging lens (X1 = 75 cm) of focal length f1 = 50 cm. A second converging lens of focal length f2 is located 200 cm from the first lens (X2 = 200 cm). An image of the object is to be formed on a screen 200 cm from the second lens (X3 = 200 cm).
What must be the focal length f2 of the second lens so that the final image appears on the screen?