Parts Of The Eye & How We See Light Test Prep

Front 1

what is the white part of the eye called?

Back 1

sclera

Hint 1

sounds like mascara

Front 2

Light is a form of ___________.

Back 2

energy

Front 3

Most light comes from the _________.

Back 3

Sun

Front 4

Is the sun a natural or artificial source of light?

Back 4

natural

Front 5

What is another name for "artificial"?

Back 5

man-made

Front 6

What type of energy does the sun produce from its nuclear reaction?

Back 6

heat

Front 7

Why does the sun glow?

Back 7

because it produces energy

Front 8

name 4 types of natural light

Back 8

sun, lightning bug, stars, moon

Front 9

name 4 types of artificial light

Back 9

neon signs, flashlights , fire, lightbulbs

Front 10

What does luminous mean? Give an example

Back 10

A luminous object is something that produces its own light. The moon, sun etc

Front 11

How do we see object that are not luminous?

Back 11

When energy from some light source hits them and bounces back from the object to our own eyes.. called reflective light.

Front 12

The path of light always follows a ______ line.

Back 12

straight

Front 13

What does transparent mean?

Back 13

Something you can see through completely. Like a window.

Front 14

What does translucent mean?

Back 14

Something where you can partly see the object through it. example wax paper

Front 15

What does opaque mean? give an example

Back 15

You cannot see through it. Wood

Front 16

What keeps dust out of your eye?

Back 16

eyelash

Front 17

What protects the front of your eye?

Back 17

eyelid

Front 18

What is the iris? What is it made of.

Back 18

The colored part of the eye. It is a colored circle of muscles.

Front 19

What is the pupil?

Back 19

The round dot in the center of the iris.

Front 20

What do your tear ducts do?

Back 20

They carry tears from your eye to your nose

Front 21

What makes tears? describe location.

Back 21

your tear glands, located in the upper outer corner of the eye.

Front 22

What is the cornea

Back 22

the clear protective, tough, outer coating that protects the eye.

Front 23

What is the iris and what is its function?

Back 23

It is the colored part of the eye that controls the opening and closing of the pupil.

Front 24

where is the retina located?

Back 24

on the back wall of the eye.

Front 25

What does the lens do?

Back 25

it focuses the light entering the eye.

Front 26

Where is the optic nerve and what is its function.

Back 26

it is at the rear of the eye and it is a nerve that carries messages from the retina to the brain

Front 27

What forms the back wall of the eye

Back 27

the retina

Front 28

What carries messages from the retina to the brain

Back 28

the optic nerve

Front 29

What part of the eye is similar to that of a camera, and how?

Back 29

The lens because it focuses the light that enters the eye

Front 30

By opening and closing, the _____ controls the amount of light that enters the eye.

Back 30

pupil

Front 31

Why do we blink our eyes?

Back 31

to clean and moisten them

Front 32

What is the light sensitive (means responds to light) part of the eye?

Back 32

the retina

Front 33

When light enters the pupil what does the light rays have to pass through?

Back 33

the cornea

Front 34

When the pupils are big, is there more light or less light coming into the eyes?

Back 34

more light

Front 35

After light has passed through the cornea and then the pupil where does it pass through next?

Back 35

the lens

Front 36

After the light has passed through the cornea, pupil, and then the lens what does the lens do with the light?

Back 36

it focuses the light on the retina

Front 37

Does the lens cause the image it focuses on the retina to be upside down?

If yes, what corrects the image so that we see things the right side up.

Back 37

yes

the brain

Front 38

What controls the amount of light entering the eye?

Back 38

iris

Front 39

We know that light travels in a ________ line, what happens to it if it is bounced off of a shiny surface like a mirror?

Back 39

It will then bounce and travel in a different direction, the direction will depend on the angle of the light beam and the angle of the mirror.

Front 40

When light travels through a transparent material other than air, like glass or water, does the light speed up or slow down.

Back 40

slow down

Front 41

What is a rainbow?

Back 41

When white light is refracted or reflected, it separates into the different colors of the rainbow spectrum.

Front 42

What does light refraction mean?

Back 42

When light bends as it passes through water or thick transparent glass.

Front 43

What do we need to see colour?

Back 43

light

Front 44

What happens when we see a red ball? What is the ball absorbing and reflecting?

Back 44

The ball is absorbing all colors except red, it is reflecting the color red and that is what we see.

If it was a blue sweater, it is absorbing all colours except blue which is being bounced back to the eye.

Front 45

What is light?

Back 45

A form of energy that stimulates the eye and makes it possible to see things.

Front 46

What is energy?

Back 46

The ability to change something or do work.

Front 47

What is opaque?

Back 47

Not allowing light to pass through.

Front 48

What is reflect?

Back 48

To throw or bounce back

Front 49

What is refract?

Back 49

To cause a change in the direction of a light beam.

Front 50

What happens when light is reflected?

Back 50

Light reflected from an object travels right into your eyes, through the cornea, pupil and lens, and then is focused onto the retina by the lens... but the picture is upside down so the brain corrects the image and lets you see right side up.

Front 51

Draw a picture of the eye and label:
CORNEA (clear cover that protects the eye)
PUPIL (round hole in the center of the iris)
IRIS (colored circle of muscles that controls the size of the pupil)
LENS (light going through the pupil then passes through the lens. The lens focuses light on the retina)
OPTIC NERVE (carries a signal from the retina to the brain)

Back 51

X

Front 52

HOW DOES LIGHT TRAVEL?

Back 52

Light always travels in a straight line and it takes the shortest path .... it does not curve. It tavels in straight lines in all directions away from its source.

Front 53

When light travels directly from a source to an object it takes the ________ path. A _________ line.

Back 53

shortest
straight

Front 54

What colours make up white light?

Back 54

All the colours of the rainbow (the visible-light spectrum)

Front 55

Does a mirror refract or reflect light?

Back 55

reflect

Front 56

Does a lens (concave or convex) reflect or refract light.

Back 56

refract

Front 57

Light ________ when it passes at an angle from one material to another.

Back 57

refracts