The magnitudes of the radii of curvature are 32.5 cm and 42.5 cm for the two faces

Question:

The magnitudes of the radii of curvature are 32.5 cm and 42.5 cm for the two faces of a biconcave lens. The glass has index of refraction 1.53 for violet light and 1.51 for red light. For a very distant object, locate and describe
(a) The image formed by violet light, and
(b) The image formed by red light.