4.2.3-Seeing Objects & How Do We See Color?

​Seeing objects-How does your eye see color?

By Jessica Freeman

How are we able to see things?

• Light travels in a straight line to an object, bounces off, then travels back to the human eye. We can see!

Multiple Choice

How are we able to see?

• Light travels in a circular wave and disappears.

• Light travels in a straight line, reflects off an object, and enters the eyeball.

• Light travels through the object, circles it, then returns to the eyeball.

Multiple Choice

The colors we see are the light that gets reflected off of the object.

• True

• False

To See Color: Black

• The object absorbs most colors of light

• Light energy changes to heat energy

Multiple Choice

What color is only seen when most of the colors of light are absorbed by an object?

• black

• green

• orange

• white

To See Color: White

• The object reflects most colors of light

• Not as much chance for light energy to change to heat energy.

Multiple Choice

What color is only seen when most the colors of light are reflected off the object?

• black

• green

• orange

• white

Light does 1 of 3 things when it hits an object

• Reflects

• Refracts

• Absorbs

​Movement of Light

​Light waves move in a straight line and can travel through empty space (vacuum).

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​Light will continue to move in a straight line unless an opaque object gets in the way. Then a shadow is formed.

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​Light can also be reflected and refracted.

​Light Reflection

​Reflection happens when light bounces off an object and moves in another direction.

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​The light will still travel in a straight line, but just in a different direction.

​Refraction

Refraction happens when light gets bent in transparent materials such as water, air, glass, or a prism.

​Refraction can cause:

• ​Objects to look bent like in water.

• ​Objects to look bigger like through a lens.

• ​A rainbow to appear when light gets broken into its 7 colors.

Multiple Choice

How does the diagram connect to the text and caption?

• It shows how the lens changes when it is dark outside.

• It shows how the shape of the lens changes when you're looking at something near or far away?

• It shows how shadows are formed.

• It shows how your eyes block the sunlight.

Multiple Choice

Light needs to _______ off an object to get to the eye for an animal to see the object.

• reflect

• shine

• get darker

• react

Multiple Choice

The color you see is the color that is ___.

• reflected
• absorbed

Multiple Choice

A leaf is green, what does this tell you about the light that is being absorbed?

• no light is being absorbed
• green is being refracted and all the colors are being absorbed.
• green is being absorbed and all the other colors are reflected
• green is being reflected and all the other colors are being absorbed

Multiple Choice

What color appears when all colors are absorbed?

• black
• red
• white
• violet

IRIS

THE COLOURED PART OF OUR EYES

PUPIL

The black hole where light enters the eye. The pupil gets big when it is dark and small when the light is bright.

Multiple Choice

Name this part of the eye.

• retina

• cornea lens

• iris

• pupil

1. ​Light enters the cornea

2. then the light goes through the pupil

3. the iris makes the pupil bigger to let more light in or smaller to let less light in.

4. light goes through the lens and focuses it on the retina.

5. The retina sends message to the brain through the optic nerve.

Multiple Choice

Name this part of the eye.

• retina

• cornea lens

• iris

• pupil

LENS, RETINA AND OPTIC NERVE

The light goes through the lens and make an image at the back of the retina. The image is upside down!!

The optic nerve transports the image to the brain and the brain flips the image.

Match

Match the following

• lens

• retina

• iris

• tear duct

• pupil

Light passes into the eye through ____

sends messages about what your eyes see to your brain

The colored part of your eye

A tiny tube that allow tears to leave your eye.

The black spot in the middle of the iris.

• Light passes into the eye through ____

• sends messages about what your eyes see to your brain

• The colored part of your eye

• A tiny tube that allow tears to leave your eye.

• The black spot in the middle of the iris.