Warm-Up Exercise 33

Due 12:15 pm, Mon 12 Nov 2012

Physics 123, Fall 2012

Reading assignment: 37.4-37.6,37.7 (if your edition of the textbook has it)

In Fig. 37.9 (8th edition) the textbook compares the reflection of light from a surface to the reflection of a wave on a rope. How does the analogy work?

The concept of "optical path length" (OPL) is used in many places to analyze optical problems. (Unfortunately your textbook doesn't use it.) See for example Wikipedia, http://en.wikipedia.org/wiki/Optical_path_length. In materials with a constant index of refraction n, the OPL is just the path length times n. In the context of today's reading, why might that be a helpful concept?