Calculate the positions of the principal planes and focal points of a thick convex-concave glass lens if

Question:

Calculate the positions of the principal planes and focal points of a thick convex-concave glass lens if the curvature radius of the, convex surface is equal to R1 = 10.0 cm and of the concave surface to R2 = 5.0 cm and the lens thickness is d = 3.0 cm.