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Chapter 12.3

Chapter 12.3. Reflection and Color. Angle of Reflection = Angle of Incidence. Balls bouncing on a pool table follow laws of reflection. Rough surfaces reflect light in many directions, called DIFFUSE REFLECTION. When the water is still, reflection is “ clearer ”.

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Chapter 12.3

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  1. Chapter 12.3 Reflection and Color

  2. Angle of Reflection = Angle of Incidence

  3. Balls bouncing on a pool table follow laws of reflection.

  4. Rough surfaces reflect light in many directions, calledDIFFUSE REFLECTION

  5. When the water is still, reflection is “clearer”

  6. The image in the convex mirror (left) looks smaller. The images in the concave mirror (right) looks bigger.

  7. How Objects React to light • Objects can be classified into three categories • Opaque • Transparent • Translucent

  8. Opaque Objects • Do not allow light to pass through them • Examples are brick, carpet, wood, apple, etc. • Objects appear the color they are because of the color of light they reflect; all other colors are absorbed

  9. Transparent Objects • Allow light to pass through them • Items are “see-through” • Examples are glass and cellophane • Objects appear the color they do based on the color/frequency of light they allow to pass through

  10. Translucent Objects • Allow some light to pass through but scatters most of the light within it • Cannot see things clearly through a translucent object • Examples are a block of wax or a frosted light bulb

  11. R O Y G B I V • Red • Orange • Yellow • Green • Blue • Indigo • Violet White light Triangular Prism

  12. More on R O Y G B I V • Why is the apple red? White light strikes the apple All colors absorbed except red Red light is reflected

  13. Still More on R O Y G B I V • What color is the apple now? Green light strikes the apple Green light is absorbed. No color is reflected so apple appears black

  14. Additive RGB Colors Green Yellow Cyan white Red Magenta Blue http://home.att.net/~B-P.TRUSCIO/COLOR.htm

  15. Adding colors of LIGHT

  16. CMY-Subtractive Colors Magenta red blue black Yellow green Cyan

  17. Pigments – they subtract specific colors of light, so you only see the colors that were not “subtracted”

  18. Refraction, or bending of light as it moves from air to water

  19. Angles are measured withrespect to the line which isperpendicular to theinterface.When light travels from one medium--such as air, toanother one of higherdensity--such as water,usually the light ray bendstoward the perpendicularline.

  20. Total Internal Reflection, as in fiber optic cables.

  21. The critical angle for diamondin air is 24.5 degrees; any raywhich strikes the surface on theinside at an angle of greaterthan 24.5 degrees will notescape the diamond.

  22. The Convex Lens       as a Magnifier

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