1. The problem statement, all variables and given/known data 2. Relevant equations I know that yin = 0.7mm, y2 = 0mm, the index of refraction for the sphere is 1.8 and the indices of refraction for the air surrounding it is 1. 3. The attempt at a solution Not sure how to even begin with the given information. I was thinking I could ray-transfer matrix analysis, but how would I set that up for this question?