A vessel has a 3-cm-thick bottom made of glass `(mu= 1.5)`. The vessel contains water `(mu = 1.33)` up to a depth of 6 cm and oil `(mu = 1.30)` up to a depth of another 7 cm. Find the apparent depth of vessel when viewed from above.

Explanation

To find the apparent depth of the vessel when viewed from above, we will calculate the contributions to the apparent depth from each layer (oil, water, and glass) using the formula for apparent depth:

\[ h' = \frac{t_1}{\mu_1} + \frac{t_2}{\mu_2} + \frac{t_3}{\mu_3} \]

where:
- \( t_1 \) is the thickness of the oil layer,
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