Refraction

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Chapter 18

• Refraction
• Lenses

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Refraction bending of light as it changes
mediums due to a change in speed.
Angles are measured from the normal
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Index of Refraction ratio of the speed of light
in a vacuum to the speed of light in a medium.
n c/v Where c speed of light (vacuum) v
speed of light (medium)
  Index of Refraction                
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Reflection and Refraction at an Interface        
           
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Refraction  The Bending of Wavefronts          
          
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Snell's Law Example                              
                  
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Understanding Refraction                         
                                              
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Illustrating Cart Analogy                       
                     
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Apparent Depth in Water                          
                            
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Refraction at Sunset                            
                                              
     
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Internal Reflection                              
               
Critical angle angle at which total internal
reflection begins.
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Internal Reflection                              
                         
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Optical Fiber                                    
                             
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Refraction in a Raindrop                        
                               
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Forming a Rainbow                              
     
 
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Refraction through a Glass Prism
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Color Dispersion through a Glass Prism
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Refraction through Lenses
Convex
Concave
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Concave Lens Images
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Defects in Spherical Lenses
                                                
                                   Fig 4.
Spherical Aberration for different lens forms a)
simple biconvex lens, b) lens best form, c)
distribution of refraction power in two lenses,
d) aspheric, almost plano convex lens
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Anatomy of the Eye
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Nearsighted Eye - Myopic                        
                                           
 
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Farsighted Eye - Hyperopic                       
                                                 
               
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lttelescopes
binocularsgt
microscope
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Homework

• Pages 508 510
• Numbers 46,49,53,55,67,70,74,82,83,86,88