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## Homework Statement

both filled to height h in the vessel of length 2h. one has refractive index root 2 and the bottom fluid has refractive index n. find the apparent depth of vessel.

## Homework Equations

n = real depth/apparent depth

## The Attempt at a Solution

what these guys have done :

apparent depth = d/sqrt(2) + d/n

I don't get it, how do you add depths like these esp. when refraction happens at medium n and medium sqrt(2).?