Summary

• Plane and spherical mirrors
• Refraction basics

• Refraction
  • index of refraction
  • ray bending applet applet
  • clear streams appear shallow applet
  • Snell's Law applet
    
    Example #1
    
    Example #2
    
  • Total internal reflection applet
  
      
  
  
• Thin lenses applet
  • three principal rays
  • thin lens equation
  • sign convention
    Example #3
    
    
  
  

klm
A light ray exits glass (n = 1.50) and enters water (n = 1.33). Which way does the ray go?
A. It bends towards the normal.
B. It bends away from the normal.
C. It does not bend.
D. It totally reflects off the interface.
Answer







gc6 23.29
Rays of the Sun are seen to make a 31.0° angle to the vertical beneath the water. At what angle above the horizon is the Sun?
A. 31.0°            B. 59.0°
C. 43.2°            D. 46.8°
Answer







klm
A 35 cm long squirrel is photographed with a l50 mm focal length lens when it is 5.0 meters from the camera. How long is the image of the squirrel on the film?
A. 1.08 cm              B. 1.17 cm
C. 8.57 mm             D. 2.33 mm
Answer







 



B. It bends away from the normal.
The wave must speed up as it enters a medium with a lower index of refraction. It must therefore bend away from the normal.












 



D. 46.8°













 



A. 1.08 cm