In Figure a fish watcher at point P watches a fish through a glass wall of a

Question:

In Figure a fish watcher at point P watches a fish through a glass wall of a fish tank. The watcher is level with the fish; the index of refraction of the glass is 8/5, and that of the water rs 4/3. The distances are d1 = 8.0 cm, d2 = 3.0 cm, and d3 = 6.8 cm.

(a) To the fish, how far away does the watcher appear to be?

(b) To the watcher, how far away does the fish appear to be?