Reflection of Light from Plane Surfaces E. Alexander Burt Unit 9 Class 2
Smooth Surface Reflection <ul><li>When a ray of light hits a smooth, reflective surface such as a mirror its direction cha...
Smooth surface reflection 2 <ul><li>Notice that both angles are measured from a line perpendicular to the surface.  This l...
Rough Surface Reflection <ul><li>If the surface is not smooth enough (see previous slide) the light will reflect, but rays...
Terminology: <ul><li>Smooth surface reflection is called “specular” reflection. </li></ul><ul><li>Rough surface reflection...
Image Formation <ul><li>We can locate images by “ray tracing” – drawing the light rays on paper and reflecting them using ...
Ray Tracing, continued <ul><li>Notice in the diagram that all five rays are reflected according to the rule. </li></ul><ul...
Ray Tracing, part 3 <ul><li>The rays of light originate at point A </li></ul><ul><li>The dotted extensions of the reflecte...
Extended Object Ray Tracing <ul><li>Notice in the diagram below that many rays have been omitted to make it less confusing...
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U9 Cn2 Planar Surface Reflection And Ray Tracing

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Introduction to specular and diffuse reflection and ray tracing

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  • Light and its nature have caused a lot of ink to flow during these last decades. Its dual behavior is partly explained by (1)Double-slit experiment of Thomas Young - who represents the photon’s motion as a wave - and also by (2)the Photoelectric effect in which the photon is considered as a particle. A Revolution: SALEH THEORY solves this ambiguity and this difficulty presenting a three-dimensional trajectory for the photon's motion and a new formula to calculate its energy. More information on https://youtu.be/mLtpARXuMbM or https://www.slideshare.net/SalehTheory/saleh-theory?qid=fa70d6c2-03f4-43e1-8177-c710dd7b3b5f&amp;v=&amp;b=&amp;from_search=1
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U9 Cn2 Planar Surface Reflection And Ray Tracing

  1. 1. Reflection of Light from Plane Surfaces E. Alexander Burt Unit 9 Class 2
  2. 2. Smooth Surface Reflection <ul><li>When a ray of light hits a smooth, reflective surface such as a mirror its direction changes </li></ul><ul><li>The angle of incidence  i is equal to the angle of reflection  r . </li></ul>
  3. 3. Smooth surface reflection 2 <ul><li>Notice that both angles are measured from a line perpendicular to the surface. This line is called a “normal” line – remember “normal force?” </li></ul><ul><li>“Smooth” as it refers to mirrors means that variations in the surface are significantly smaller than the wavelength of light. </li></ul><ul><li>Remember, visible light has wavelengths from 400 to 700 nm </li></ul>
  4. 4. Rough Surface Reflection <ul><li>If the surface is not smooth enough (see previous slide) the light will reflect, but rays landing at different points will reflect at different angles. </li></ul>
  5. 5. Terminology: <ul><li>Smooth surface reflection is called “specular” reflection. </li></ul><ul><li>Rough surface reflection is called “diffuse” reflection. </li></ul><ul><li>Examples: </li></ul><ul><ul><li>A mirror exhibits specular reflection </li></ul></ul><ul><ul><li>A sheet of white paper exhibits diffuse reflection. </li></ul></ul>
  6. 6. Image Formation <ul><li>We can locate images by “ray tracing” – drawing the light rays on paper and reflecting them using a protractor and a ruler. </li></ul>
  7. 7. Ray Tracing, continued <ul><li>Notice in the diagram that all five rays are reflected according to the rule. </li></ul><ul><li>The reflected rays are extended, using dotted lines, to the point where they cross behind the mirror. </li></ul>
  8. 8. Ray Tracing, part 3 <ul><li>The rays of light originate at point A </li></ul><ul><li>The dotted extensions of the reflected rays cross at point A’ </li></ul><ul><li>A’ is the location of the image of A </li></ul><ul><li>By picking several points and following this process, we can find the reflected image of a larger object. </li></ul>
  9. 9. Extended Object Ray Tracing <ul><li>Notice in the diagram below that many rays have been omitted to make it less confusing! </li></ul>

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