Summary

• Maxwell's equations
• Electromagnetic waves

• Class Quiz
  
  
• Light rays
• Law of Reflection applet
  • mirror demos
  • plane mirrors applet
  • virtual images
    
    Example #1
    
  • retroreflectors
  
  
  
  
• Spherical mirrors
  • center of curvature
  • focal point
  • three principal rays applet
  • mirror equation
    
    Example #2
    
  
  

klm
What would be the beat frequency if radio waves of wavelength 3.141 m and 3.135 m are mixed?
A. 50 GHz          B. 6.0 MHz
C. 609 kHz          D. 183 kHz
Answer







klm
What is the shortest mirror in which a 2.0-m tall person can see her entire body?
A. 0.5 m       B. 1.0 m       C. 2.0 m
D. Depends on distance to mirror
Answer







 



D. 183 kHz













 



B. 1.0 m
The ray emerging from the person's foot will strike the mirror at waist level before entering the person's eye. Note the diagram: