A narrow beam of parallel light rays is incident on a glass sphere from the left, directed toward the center of the sphere. (The sphere is a lens but certainly not a thin lens.) Approximate the angle of incidence of the rays as 0o, and assume that the index of refraction of the glass is n 12.0.

(a) In terms of n and the sphere radius r, what is the distance between the images produced by the sphere and the right side of the sphere?

(b) Is the image to the left or right of that side?