1. Sound Waves

2. EM Waves

7. ConcepTest You hold a hand mirror 0.5 m in front of you and look at your reflection in a full-length mirror 1 m behind you. How far behind the big mirror does the image of your face appear? 1.0 m 0.5 m A) 0.5 m B) 1.0 m C) 1.5 m D) 2.0 m E) 2.5 m

8. ConcepTest When watching the sun set over the ocean, one often sees a long streak of light on the water, as shown at right. This occurs when A) the ocean is unusually calm B) the ocean is wavy C) the atmospheric conditions are just right

9. Images We see when light from an object enters the eye. The brain assumes that all light travels in a straight line. objectimage Image position: 1. trace rays from object to mirror to eye 2. extend rays back behind mirror to form image

10. ConcepTest An observer at point O is facing a mirror and observes a light source S. Where does the observer perceive the mirror image of the source to be located? S O A B C D mirror

11. ConcepTest An observer at point O is facing a mirror and observes a light source S. Where does the observer perceive the mirror image of the source to be located? S O A B C D mirror

12. Answers to Concept Questions D) 2.0 m B) the ocean is wavy Different angles of incidence (different normals) for each ray! Where does the observer perceive the mirror image of the source to be located? S O A B C D mirror B