Chapter 9, Problem 28Q

(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically involve integrating or extending the concepts presented thus far.)

. A light ray in air enters a block of clear plastic as shown in Figure 9.84. Which of the numbered paths represents the correct one for the ra in the plastic? Justify your choice by appealing to the appropriate law(s) of optics.