Light Mixing

Light and color

Interactive HOMEWORK Lesson
Gss108

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Multiple Choice

Light is a kind of.....

• reflection
• energy
• heat
• matter

The electromagnetic spectrum

• We usually think of "light" as the light we can see, visible light.

• Scientists also include the rest of the electromagnetic spectrum when they talk about light

• Visible light can be split up into different colors

https://image.shutterstock.com/image-illustration/visible-light-wave-length-difference-260nw-514067863.jpg

Multiple Select

Each color of light has a different _____ and ____ (select two)

• wavelength

• amplitude

• speed

• frequency

Multiple Choice

What kind of light propagates (moves well) in water?

• Ultraviolet

• Gamma

• Infrared

• Visible light

When light hits an object it can be:

• Reflected

• Absorbed

• Transmitted (go through)

Reflected light

• We see objects ONLY when light reflects off of them and reaches our eyes

• The color of an object depends on what color of light it reflects

• For example RED objects reflect only red light.

Multiple Choice

What color light does a traffic cone reflect?

• Orange

• Blue

• Green

• Purple

Absorb

• Light that an object doesn't reflect is absorbed

• Absorbed light gets turned into heat

• This is why darker colored objects heat up more in the sun

Multiple Choice

If you want to warm up on a cold day what color should you wear?

• White

• Grey

• Yellow

• Black

Multiple Choice

If you want to help a house stay cool in a hot climate what color would you make the roof?

• White

• Grey

• Black

• Purple

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Humans have 2 kinds of receptors in their eyes

• Rods sense the amount of light

• Cones sense color

• There are 3 kinds of cones: Red, Green and Blue - which happens to be the three primary colors of LIGHT

Multiple Choice

What do the CONES in your eyes sense?

• Amount of light

• Colors

Multiple Choice

What do the RODS in your eyes sense?

• Amount of light

• Colors

Multiple Select

What are the 3 colors our cone receptors sense? (select 3)

• Red

• Yellow

• Green

• Blue

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Additive colors

• Technology that projects light uses additive color mixing

• Our eyes sense color through additive mixing

• TV's, computer screens, projectors all use additive color mixing

• ADDING ALL THE COLORS MAKES WHITE

The three additive primary colors of light are RED, GREEN and BLUE.

Multiple Select

What colors do tv screens use to make all the colors (choose 3)

• Red

• Yellow

• Green

• Blue

Multiple Choice

In additive color mixing: Red and Green make:

• Cyan

• Yellow

• White

• Magenta

Multiple Choice

In additive color mixing: Red and Blue make:

• Cyan

• Yellow

• White

• Magenta

Multiple Choice

In additive color mixing: Green and Blue make:

• Cyan

• Yellow

• White

• Magenta

Multiple Choice

How do tv screens make white or how do your eyes sense white?

• No colors of light

• Equal amounts of all colors

• Only a small amount of all colors

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Subtractive color mixing

• This is the color mixing used in printing

• Red, Yellow, Blue are the primary colors you recognized from painting

• Cyan, Magenta and Yellow are used in printing (with black)

In subtractive color mixing you get white by NOT adding any colored ink or paint.

Mixing paints and inks

• Red + Blue = Purple

• Red + Yellow = Orange

• Yellow + Blue = Green

• All three = Black

• None = White

Multiple Select

What colors of paint would you mix to get orange?

• Red

• Yellow

• Blue

Multiple Select

What colors of paint would you mix to get green?

• Red

• Yellow

• Blue

Multiple Select

What colors of paint would you mix to get purple?

• Red

• Yellow

• Blue