Warm-Up Exercise 29

Due 12:15 pm, Fri 2 Nov 2012

Physics 123, Fall 2012

Reading assignment: 36.3-36.4

In the previous day's reading, we found a relationship for the distance of an object and the distance of its image for a reflecting surface, the "mirror equation". Today we've done the same but for a refracting surface, the "thin lens equation". The two equations look identical. How exactly are they different? (Don't answer in purely mathematical language.)

When you look straight down at an object under water, will it appear to be closer to you or farther away than actuality? Why?