Chapter 12 3
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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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Chapter 12 3

Chapter 12.3

Reflection and Color


Angle of reflection angle of incidence

Angle of Reflection = Angle of Incidence


Balls bouncing on a pool table follow laws of reflection

Balls bouncing on a pool table follow laws of reflection.


Rough surfaces reflect light in many directions called diffuse reflection

Rough surfaces reflect light in many directions, calledDIFFUSE REFLECTION


When the water is still reflection is clearer

When the water is still, reflection is “clearer”


Chapter 12 3

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


How objects react to light

How Objects React to light

  • Objects can be classified into three categories

    • Opaque

    • Transparent

    • Translucent


Opaque objects

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


Transparent objects

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


Translucent objects

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


R o y g b i v

R O Y G B I V

  • Red

  • Orange

  • Yellow

  • Green

  • Blue

  • Indigo

  • Violet

White light

Triangular Prism


More on r o y g b i v

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


Still more on r o y g b i v

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


Additive rgb colors

Additive RGB Colors

Green

Yellow

Cyan

white

Red

Magenta

Blue

http://home.att.net/~B-P.TRUSCIO/COLOR.htm


Adding colors of light

Adding colors of LIGHT


Cmy subtractive colors

CMY-Subtractive Colors

Magenta

red

blue

black

Yellow

green

Cyan


Pigments they subtract specific colors of light so you only see the colors that were not subtracted

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


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

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


Chapter 12 3

  • 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.


Total internal reflection as in fiber optic cables

Total Internal Reflection, as in fiber optic cables.


Chapter 12 3

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.


Chapter 12 3

  • The Convex Lens       as a Magnifier


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