Computer Science homework help

A glass sphere has radius R = 5.0 cm and index of refraction 1.7. A paperweight is constructed by slicing through the sphere along a plane that is 2.0 cm from the center of the sphere, leaving height h = 3.0 cm. The paperweight is placed on a table and viewed from directly above by an observer who is distance d = 8.4 cm from the tabletop (figure below). When viewed through the paperweight, how far away does the tabletop appear to be to the observer