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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

Chapter 12.3

Reflection and Color

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

  • 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








Cmy subtractive colors
CMY-Subtractive Colors








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”

  • Angles are measured with waterrespect 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, wateras in fiber optic cables.

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