What is the index of refraction of the tank's walls?

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1. A particular fish tank filled with fresh water (n = 1.33) has a coral reef sticker stuck to the exterior wall outside the fish tank. The tank's walls are 2 cm thick, but a goldfish inside the tank sees the sticker 0.6 cm away from the water-wall interface. What is the index of refraction of the tank's walls?



s' = (n2/n1) * (s)



Plugged in the values into the aforementioned equation and got an index of refraction of either 0.339 or 4.43, depending on which index is in the numerator and which is in the denominator (and vice versa).

 

[Simon Bridge]

Welcome to PF;
Do you have a question? Don't make us guess!

You have correctly ascertained that this is a false-depth question. The way to figure out which bit goes where is to draw the ray diagram of the situation.
Of course, you can easily sort out your two numbers by looking at the definition of refractive index: what is it exactly?