A slab of Plexiglas $2.00 \mathrm{~cm}$ thick with index of refraction 1.51 is placed over a physics textbook. The slab has parallel sides. The text is at height $y=0 .$ Consider two rays of light that are leaving the letter ${ }^{4} \mathrm{t}$ " in the text under the Plexiglas and going toward an observer who is above the Plexiglas, looking down. Draw on the figure the apparent $y$ -position of the text under the Plexiglas as seen by the observer. Hint: From where in the Plexiglas do these rays appear to originate for the observer? Using the two rays $A$ and $\mathrm{B}$ after they have exited the Plexiglas, determine the apparent height $(y$ -position $)$ of the text under the Plexiglas as seen by the observer. You can easily do this experiment yourself. If you do not have a block of glass or Plexiglas, you can try placing a flat-bottomed drinking glass over the text.