A vessel is filled with two different liquids which do not mix. One liquid is 40 cm deep and has n1 = 1.6 and the other is 30 cm deep and has n2 = 1.5. What is the apparent depth of the vessel when viewed along the normal?

Dear Student,
Please find below the solution to the asked query:

When you see along the normal then there will be no refraction of the light and the apparent depth will be equal to the actual depth.

Or, 
apparent depth = 40 + 30 = 70 cm = 0.7 m


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Satyendra Singh

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I think here apparent depth is equal to actual depth I.e. 70 cm because when we see in vessel along with normal then no refraction take place as speed of light remain same throughout liquid and we see the actual depth only
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