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 `4//3` .
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 ?

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`