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.
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Presentation on theme: "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."— Presentation transcript:
1 ColorWhite 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 with a prism:This is how rainbows are formed: sunlight is “split up” by raindrops.
2 The colors of the rainbow: RedOrangeYellowGreenBlueIndigoVioletRemember: Roy G. Biv !!!
3 Light from the SunThe light from the sun contains a grand mixture of electromagnetic waves of varying frequency (i.e. wavelength)The spectrum of light is characteristic of the TEMPERATURE of the sun!
4 Wavelengths of Light Red Light – l = 680 nm Green Light - l = 500 nm Blue Light - l = 470 nm
5 Adding colorsWhite light can be split up to make separate colours. These colours can be added together again.The primary colours of light are red, blue and green:Adding blue and red makes magenta (purple)Adding blue and green makes cyan (light blue)Adding red and green makes yellowAdding all three makes white again
6 Only red light is reflected Seeing colorThe colour an object appears depends on the colors of light it reflects.For example, a red book only reflects red light:HomeworkWhitelightOnly red light is reflected
7 (or red and blue, as purple is made up of red and blue): A pair of purple pants, in addition to being ugly, would reflect purple light(or red and blue, as purple is made up of red and blue):Purple lightA white hat would reflect all seven colors:Whitelight
8 Using colored lightIf we look at a colored object in colored light we see something different. For example, consider the outfit below – I mean, from a physics standpoint, not as a fashion choice:Shirt looks redWhitelightShorts look blue
9 In different colors of light this kit would look different: RedlightShirt looks redShorts look blackShirt looks blackBluelightShorts look blue
10 Using filters Red Filter Filters can be used to “block” out different colours of light:Red FilterMagenta Filter