The bottom of a container is a 6 cm thick glass $(μ=1.5)$ slab. The container contains a thick layer of water $(μ_w=1.33)$, 4 cm on top of the glass. What is the apparent position of a scratch on the outer surface of the bottom of the glass slab when viewed through the container?

1 cm 2 cm 3.5 cm 3 cm

3 cm

The correct answer is Option (4) → 3 cm