This is figure 2:

2. What does a fish in a lake see when it looks up toward the smooth surface of a lake? 3. Start with snell's Law and and the information in Figure 2. and derive (2). 'Jsing Snell's Law and trigonometry. the index of refraction of the glass plate can be found as JDz+l6t2 D n: 4. Derive (3). inD \\ID2 +16z'2 ( ) incoming light air, n = 1 glass , n dark | illuminated Figure 2. Light incident at point 0 scatters and produces a dark circle and an illuminated ring