A zoo aquarium has transparent walls, so that spectators on both sides of it can

Question

A zoo aquarium has transparent walls, so that spectators on both sides of it can watch the fish. The aquarium is 5.50 m across, and the spectators on both sides of it are standing 1.20 m from the wall. How far away do spectators on one side of the aquarium appear to those on the other side? (Ignore any refrac- tion in the walls of the aquarium.)

I know I am supposed to use to equation na / So + Nb / Si = 0. However, when I do that I get the wrong answer. Am I supposed to use the refractive index of water as Na and the refractive index of air as Nb? Why would I do that if the image travels through the air and then the water?

Explanation / Answer

here ,

the L be the total distance appearing between the spectators

L = 2 * 1.2 + 5.5*na/nw

L = 2.4 + 5.5/1.33

L = 6.34 m

spectators on one side of the aquarium appear6.34 m away to those on the other side

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