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Visible light and Color

+What is an observation?

Something you see or notice

+Look around the room with the lights on and off….

Light ON Light OFF

+What’s the difference?

Objects seem brighter and in more color when the light is on. Dark rooms lack color and detail.

+What does it mean to be illuminated?

An object reflects light

+What types of light are there?

Incandescent, fluorescent, neon, sodium vapor, tungsten, halogen

+What does incandescent mean?

WHITE HOT – filament gets hot

+What is a filament?

A small piece of coil that glows when it gets hot

+What does all color depend on?

How it reflects and refracts light

+You see….

An objects color based on what light it reflects and absorbs

+What about Black and white?

Black White

+Why can’t you see well at night?

There is no light to reflect off objects so your cones are not used at night

+What about colored light?

An object will look different colors based on the color of light because different colors are reflected or reflects into your eye

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+What is a prism?

A triangular shaped translucent object which reflects light

+Picture time!

+Picture time!

+Picture time!

+Picture time!

+What is Visible light

Shorter wavelengths and higher frequencies than infrared…

Colors ROYGBIV

+Wavelength

Red shortest

Violet longest