$1.$John at point Plooks at a fish through a glass wall of a fish tank as shown in Fig. B$1.$ Suppose di$=10$ cm$,$ d$2=2$cm$,$ d$3=15$ cm$,$ nglass $=1\mathrm{.}50,$ and nwater $=1\mathrm{.}33,$ how far does the fish appear relative to point P$?$