3 (10 points) Find the image location and magnification of an object 30 cm from the front

doublet of the thin-lens combination in the figure. Using lens equation and ray tracing.

10 cm

q

H

- +30 cm

√₂--20 cm

fi

4 (10 points) Consider a thin converging lens L1. Use ray tracing to show that if a second

converging lens L2 (with the same focal length) is placed behind L1 at the focal plane of L1, the

magnification does not change from that with L1 only.