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Review
Can you name this wave phenomena?
Interference or beats
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Reflection Notes
B.
Reflection
1. Law of Reflection
![](../simple_periscope_demonstrating_hg_wht.gif)
a. θ of incidence =
θ of reflection
Use the acute angles on your protractor /p>
![](../protractor.gif)
Charles William Weick Elementary Mechanical Drawing,
Theory and Practice
(New York: McGraw-Hill Book Company, 1915) 21
ETC Clipart |
Protractor
Line going through O, we will
refer to as the baseline
![](../img81.gif) |
θin = θincidence
(angle incoming normal ray
makes
with the normal)
θref = θreflect
(angle reflected light makes with the normal)
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Ray Diagram - Reflection
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![](../img84.gif)
Remember ...
![](../george_washington_bandana_patriot_md_wht.gif)
... reflection always makes a V
What is the smallest mirror
you need to see
your whole body?
![](../girlMirror.gif)
![](../Light.14.gif)
1/2 your height
Click and Drag Gecko
[ Flash ]
The image from a plane mirror:
a. Virtual (realistic) & Upright (Straight up and down)
[ Flash ]
![](../Light.12.gif)
![](../Light.13.gif)
b. Incident ray, normal line, and reflected rays are all in the same plane
![](../reflect_35937_lg.gif)
Source: Elroy M. Avery School Physics (New York:
Sheldon and Company, 1895) 77
Clipart ETC
c. The distance the object is in front of the mirror
equals the distance the image is behind the mirror
2. Two Basic Kinds of Reflection
a. Regular Reflection – reflection off a polished surface (produces images)
![](../img87.gif)
Regular Reflection Produces Images
![](../astronautreflection.gif)
http://www.freeimages.co.uk/
b. Diffuse Reflection – reflection
off an irregular surface causing light to scatter (no image)
![](../img8A.gif)
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Which letter correctly
shows reflection?
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![](../img45.gif)
Ray C
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Angle of Reflection?
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June 2009
60 degrees
(Angle from normal)
Dr. Carlson - Purdue University
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Refraction
![](../32618044.gif)
![](../smmetrose.gif)
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