An object approaches a convergent lens from the left of the lens with a uniform speed $5 \mathrm{m}/\mathrm{s}$ and stops at the focus. The Image

 The direction of ray of light incident on a concave mirror is shown by $\mathrm{PQ}$ while directions in which the ray would travel after reflection is shown by four rays marked $1, 2, 3$ and $4$
(Figure). Which of the four rays correctly shows the direction of reflected ray?

The optical density of turpentine is higher than that of water while its mass density is lower. Figure given below shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in figure, the path shown is correct?