Presentation is loading. Please wait.

Presentation is loading. Please wait.

Light & Color.

Published byLenard Jones Modified over 8 years ago

Similar presentations

Presentation on theme: "Light & Color."— Presentation transcript:

1 Light & Color

2 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

3 Dispersion & Recomposition:
If a prism is placed in a beam of white light:

4 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

5 Recomposition recombines the colors of the spectrum

6 Capable of absorbing ROYBIV
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

7 If all absorbed, then object appears black
If all reflected, then object appears white

8 Ex. What color will the objects appear to be? RO GBIV nothing BLACK
ROYGBIV ROYGBIV ROYGBIV nothing BLACK Capable of absorbing ROY Capable of absorbing YGBIV Capable of absorbing ROYGBIV

9 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

10 Filters will only allow specific colors of light (& the color on either side in the spectrum) to pass Ex. ROYGBV GBV Blue Filter

11 Ex. White light passes through a yellow filter. What color light will pass? ROYGBV OYG Yellow Filter

12 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!!!

13 Ex. A white dress is viewed under a blue filer. What color will the dress appear? BLUE ROYGBV GBV Blue Filter

14 Ex. A yellow shirt is viewed under a green filer. What color will the shirt appear? Yellow ROYGBV YGB Green Filter

15 Ex. A red shirt is viewed under a yellow filer. What color will the shirt appear? BLACK ROYGBV OYG Yellow Filter

16 Ex. A blue shirt is viewed under red light. What color will it appear? ROYGBV BLACK

17 Ex. A blue shirt is viewed under green light. What color will it appear? ROYGBV BLUE

18 Standing on a stage, a singer is illuminated by three lights, each emitting a different color.
Ex. When the first light is used, he appears to be wearing black shoes, red pants & a red shirt 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?

19 RO RO Shoes Pants Shirt 1st Light Blk Red 2nd Light Blue 3rd Light
Reflecting blue so…. Reflecting red so… Reflecting all so… Shoes are blue Pants are red Shirt is white Shoes Pants Shirt 1st Light Blk Red 2nd Light Blue 3rd Light Green ----- RO RO Red GBV ----- GBV Blue ----- ----- YGB Green

20 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

21 By adding primary colors of light, other colors can be produced Ex.
TVs, computers, stage lights Yellow Red Green White Magenta Cyan Blue

22 Ex. Yellow Magenta Cyan

23 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

24 Light will appear “light pink”
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”

25 Pigment capable of absorbing blue light
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 R G B R G Pigment capable of absorbing blue light

26 Pigment capable of absorbing green light
Ex. What color would an object capable of absorbing blue light appear? Green absorbed Red & Blue Reflected Therefore object “appears” magenta R G B R B Pigment capable of absorbing green light

27 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

28 Try: Worksheet

Download ppt "Light & Color."

Similar presentations

Light (or the ELECTROMAGNETIC SPECTRUM)

Light (or the ELECTROMAGNETIC SPECTRUM)
Light & Color.

Light & Color.
Color.

Color.
Chapter 28 Color.

Chapter 28 Color.
Visible Light and Color

Visible Light and Color
CP Physics Mr. Miller. General Information  Sir Isaac Newton – first to realize white light composed of different colors  Prisms – separate white light.

CP Physics Mr. Miller. General Information  Sir Isaac Newton – first to realize white light composed of different colors  Prisms – separate white light.
This student is looking at many colors on his computer screen

This student is looking at many colors on his computer screen
Color White light is not a single color; it is made up of a mixture of the seven colors of the rainbow. We can demonstrate this by splitting white light.

Color White light is not a single color; it is made up of a mixture of the seven colors of the rainbow. We can demonstrate this by splitting white light.
Color.

Color.
SUBTRACTIVE COLOUR MIXING SUBTRACTIVE COLOUR MIXING ADDITIVE COLOUR MIXING ADDITIVE COLOUR MIXING.

SUBTRACTIVE COLOUR MIXING SUBTRACTIVE COLOUR MIXING ADDITIVE COLOUR MIXING ADDITIVE COLOUR MIXING.
ColorColor. Isaac Newton first studied light when he used a piece of glass and first saw the color spectrum.

ColorColor. Isaac Newton first studied light when he used a piece of glass and first saw the color spectrum.
Colour Theory.

Colour Theory.
Light and Color.

Light and Color.
Electromagnetic Waves and Color Physics Mrs. Coyle.

Electromagnetic Waves and Color Physics Mrs. Coyle.
Chapter 28 Color. Spectrum: The spread of colors seen when light is passed through a prism or diffraction gradient.

Chapter 28 Color. Spectrum: The spread of colors seen when light is passed through a prism or diffraction gradient.
This student is looking at many colors on his computer screen

This student is looking at many colors on his computer screen
ROY G BIV The natural light that we see coming from the sun is generally perceived as white light. But we have all seen colored light in the form of a.

ROY G BIV The natural light that we see coming from the sun is generally perceived as white light. But we have all seen colored light in the form of a.
Color. Color 1. SELECTIVE REFLECTION Most objects reflect rather than emit light. Radiations that match the resonant frequencies of the atoms are.

Color. Color 1. SELECTIVE REFLECTION Most objects "reflect" rather than emit light. Radiations that match the resonant frequencies of the atoms are.
Light & Color What happens to the light that strikes an object? What determines the color of opaque, transparent & translucent object? How is mixing pigments.

Light & Color What happens to the light that strikes an object? What determines the color of opaque, transparent & translucent object? How is mixing pigments.
Light and color.

Light and color.

Similar presentations

Ads by Google