1. The problem statement, all variables and given/known data As shown in the figure, the distance between the object and hemisphere lens is R0. The hemisphere lens radius is R0. Find the distance between the image and the flat side of the lens if observing from the curved side of the lens. Refractive index of glass and air are n and 1 respectively. 2. Relevant equations n1/s + n2/s' = (n2-n1)/R 3. The attempt at a solution Refracting on the flat side s is -R0 -1/R0 + n/s' = (n-1)/∞ s' = R0n Did I do the first step correctly? And what should I do next?