Thick lens for two focal spots F1 and F2, two principal planes PP1 and PP2, and two nodal planes PN1 and PN2. A blue ray comes in parallel to the axis and goes through the focus F2, a green ray goes through F1 and comes out parallel after the principal plane and a red ray comes from the nodal plane and comes out at the same angle at the second nodal plane.

Thick lens