vb6-5) An observer looks from the outside of a spherical aquarium with a radius of 21 cm at a fish that swims in the water of the aquarium. 

The thin glass wall has negligible equal thickness everywhere. 

Where does the observer see the fish when it swims on the line connecting the observer and the center of the bowl at a distance of 17 cm 

from the nearest wall to the observer? 

The relative refractive index of the water to the air is 1.33.