Light color
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Light & Color. Light:. Light that can be sensed by our eyes is Visible Light Visible light consists of a continuous range of wavelengths or frequencies Specific wavelengths correspond to a specific color based upon how we perceive light of that wavelength . Dispersion & Recomposition:.

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Light
Light:

  • Light that can be sensed by our eyes is Visible Light

  • Visible light consists of a continuous range of wavelengths or frequencies

  • Specific wavelengths correspond to a specific color based upon how we perceive light of that wavelength


Dispersion recomposition
Dispersion & Recomposition:

  • If a prism is placed in a beam of white light:


  • Dispersion occurs resulting in the ‘separation’ of light into a spectrum of colors

  • A type of refraction

    • Refractive index varies with the wavelength or color of light

    • Dispersion due to different refractive angles

  • How rainbows occur



ROYBIV all absorbed by object

G reflected

Therefore object “appears” green

G

ROYGBIV

Capable of absorbing ROYBIV


  • If be all absorbed, then object appears black

  • If all reflected, then object appears white


Ex. be

What color will the objects appear to be?

RO

GBIV

ROYGBIV

ROYGBIV

ROYGBIV

nothing BLACK

Capable of absorbing ROY

Capable of absorbing YGBIV

Capable of absorbing ROYGBIV


Viewing objects
Viewing objects: be

  • Objects may be viewed through filters &/or under different light

  • Causing the color of objects to be perceived differently

  • Recall white light is ROYGBIV


  • Filters be will only allow specific colors of light (& the color on either side in the spectrum) to pass

  • Ex.

ROYGBV

GBV

Blue Filter


Ex. be

White light passes through a yellow filter. What color light will pass?

ROYGBV

OYG

Yellow Filter



Ex. reflected

A white dress is viewed under a blue filer. What color will the dress appear?

BLUE

ROYGBV

GBV

Blue Filter


Ex. reflected

A yellow shirt is viewed under a green filer. What color will the shirt appear?

Yellow

ROYGBV

YGB

Green Filter


Ex. reflected

A red shirt is viewed under a yellow filer. What color will the shirt appear?

BLACK

ROYGBV

OYG

Yellow Filter


Ex. reflected

A blue shirt is viewed under red light. What color will it appear?

ROYGBV

BLACK


Ex. reflected

A blue shirt is viewed under green light. What color will it appear?

ROYGBV

BLUE


Ex. reflected

When the first light is used, he appears to be wearing black shoes, red pants & a red shirt

Standing on a stage, a singer is illuminated by three lights, each emitting a different color.

When the second light is used, he appears to be wearing blue shoes, black pants & a blue shirt

When the third light is used, he appears to be wearing black shoes, black pants & a green shirt

What color are the singer’s shoes, pants & shirt?


Reflecting blue so…. reflected

Reflecting red so…

Reflecting all so…

Shoes are blue

Pants are red

Shirt is white

-----

RO

RO

Red

GBV

-----

GBV

Blue

-----

-----

YGB

Green


Color addition
Color Addition: reflected

  • White light is ROYGBIV but…

  • White light can also be produced by adding colors (or frequencies)

  • Any three colors of light which produce white light when combined are primary colors of light

  • RED, GREEN & BLUE


Yellow

Red

Green

White

Magenta

Cyan

Blue


Ex. produced

Yellow

Magenta

Cyan



Ex. intensities produce white are

If magenta light and yellow light are added together, will white light be produced?

Magenta = Red & Blue

Yellow = Red & Green

Light will appear “light pink”


Color subtraction
Color Subtraction: intensities produce white are

  • Process of “removing” color

  • Increasing absorption of colors and decreasing reflection of colors

  • Ex.

  • Paint pigments, printer ink

Blue absorbed

Red & Green Reflected

Therefore object “appears” yellow

RGB

RG

Pigment capable of absorbing blue light


Ex. intensities produce white are

What color would an object capable of absorbing blue light appear?

Green absorbed

Red & Blue Reflected

Therefore object “appears” magenta

RGB

RB

Pigment capable of absorbing green light


Primary colors (pigments) of paint are intensities produce white are cyan, magenta & yellow

Blue

Cyan

Magenta

Cyan absorbs Red

Magenta absorbs Green

Yellow absorbs Blue

Green

Red

Yellow

Each primary color of paint absorbs one primary color of light


Try: intensities produce white are

Worksheet


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