A vessel of depth 2d cm is half filled with a liquid of refractive index μ1 and the upper half with a liquid of refractive index μ2. The apparent depth of the vessel seen perpendicularly is
The apparent depth is given by hh′ = μ
The apparent depth of liquid 1 = dd′ = μ1
The apparent depth of liquid 2 = dd′ = μ2
Total apparent depth is given by