Two rays traveling parallel to the principal axis strike a large plano-convex lens having a refra

Two rays traveling parallel to the principal axis strike a large plano-convex lens having a refra
Two rays traveling parallel to the principal axis strike a large plano-convex lens having a
refractive index of 1.60 (Figure 2.1). If the convex face is spherical, a ray near the edge
does not pass through the focal point and spherical aberration is said to have occurred.
If this face has a radius of curvature, R, of magnitude 20.0 cm and the two rays are h1 =
0.5 cm and h2 = 12.0 cm from the principal axis, find the difference in positions where
they cross the principal axis.