Chapter 35, Problem 8P

In Fig 35-33, two light pulses are sent through layers of plastic with thickness of either L or 2L as shown and indexes of refraction n₁ = 1.55, n₂ = 1.70, n₃ = 1.60, n₄ = 1.45, n₅ = 1.59, n₆ = 1.65, and n₇ = 1.50. (a) Which pulse travels through the plastics in less time? (b) What multiple of L/c gives the difference in the traversal times of the pulses?

Figure 35-33 Problem 8.