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 & Color

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Light color

Light & Color


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:


Light color

  • 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


Light color

  • Recomposition recombines the colors of the spectrum


Light color

  • When light strikes an object, the specific wavelengths can be absorbed or reflected

  • The wavelengths that are reflected by an object, cause the perceived color of the object

  • Ex.

ROYBIV all absorbed by object

G reflected

Therefore object “appears” green

G

ROYGBIV

Capable of absorbing ROYBIV


Light color

  • If all absorbed, then object appears black

  • If all reflected, then object appears white


Light color

Ex.

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:

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

  • Causing the color of objects to be perceived differently

  • Recall white light is ROYGBIV


Light color

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

  • Ex.

ROYGBV

GBV

Blue Filter


Light color

Ex.

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

ROYGBV

OYG

Yellow Filter


Light color

  • Recall colors are perceived b/c of the color of light reflected

  • Viewing objects under different color light will affect the perceived color since some colors may or may not be present to be reflected!!!


Light color

Ex.

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

BLUE

ROYGBV

GBV

Blue Filter


Light color

Ex.

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

Yellow

ROYGBV

YGB

Green Filter


Light color

Ex.

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

BLACK

ROYGBV

OYG

Yellow Filter


Light color

Ex.

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

ROYGBV

BLACK


Light color

Ex.

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

ROYGBV

BLUE


Light color

Ex.

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?


Light color

Reflecting blue so….

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:

  • 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


Light color

  • By adding primary colors of light, other colors can be produced

  • Ex.

  • TVs, computers, stage lights

Yellow

Red

Green

White

Magenta

Cyan

Blue


Light color

Ex.

Yellow

Magenta

Cyan


Light color

  • Any two colors of light which when mixed together in equal intensities produce white are complementary colors of eachother

  • Ex.

    • Red & Cyan

    • Blue & Yellow

    • Green & Magenta


Light color

Ex.

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:

  • 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


Light color

Ex.

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


Light color

Primary colors (pigments) of paint 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


Light color

Try:

Worksheet


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