The problem involves geometrical optics, specifically focusing on the behavior of a lens made of glass with different refractive indices for red and violet light. The objective is to find the distance between the foci for these two colors of light.
The discussion is ongoing, with some participants suggesting the use of the lens maker's formula as a potential approach. There is an acknowledgment of the need to clarify how the radius relates to the angles of incidence.
Participants are working under the constraints of the problem statement, which specifies the refractive indices for different colors of light and the radius of the lens surfaces. There may be assumptions about the uniformity of the incident angles for both beams.