Warm-Up Exercise 25

Due 12:15 pm, Wed 24 Oct 2012

Physics 123, Fall 2012

Reading assignment: 35.1-35.5

In section 35.1, your book says: "The question "Is light a wave or a particle" is inappropriate, however. Sometimes light acts like a wave, and other times it acts like a particle." Do your best to explain to a friend in junior high school what that means and how it can be possible.

A beam of light passes through a hole of diameter d in a metal plate. Under what condition are we allowed to ignore the diffraction or “spreading” of the light?

In the movies or on TV, you sometimes see an actor looking in a mirror and you can see a front view of his/her face in the mirror. During the filming of such a scene, what does the actor see in the mirror?