In figure, a fish watcher watches a fish through a `3.0 cm` thick glass wall of a fish tank. The watcher is in level with the fish, the index of refraction of the glass is `8//5` and that of the water is `4//3.`

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

Explanation

a. Distance of the watcher as seen from fish
`8xx(4)/(3)+3xx(4//3)/(8//5)+10=(139)/(6)cm`
b. Distance of the fish as seen from watcher is
`10/(4//3)+(3)/(8//5)+8=(139)/(8)cm`