A small fish swims at the centre of a round glass bowl of radius $15\ \text{cm}$ filled with water (refractive index $4/3$), as shown in the figure. Ignore the thin glass wall. Seen from outside, through the side of the bowl, the fish appears to be

Fig. 1: A round bowl of water of radius 15 cm with a small fish at its centre, seen by an observer from the side.