Grade 4 Light

Question 1

What is light?

Answer 1

Energy that is visible to the human eye.

Question 2

What is a wave?

Answer 2

A vibration that moves energy from one place to another.

Question 3

Explain reflect.

Answer 3

The action of light bouncing off of an object like a mirror.

Question 4

Explain absorb.

Answer 4

When light changes to heat when entering an object, light a black shirt.

Question 5

What does transparent mean?

Answer 5

A word that describes an object that allows light pass through it.

Question 6

Give an example of something that is transparent.

Answer 6

Clear glass, plastic wrap.

Question 7

What does opaque mean?

Answer 7

A word that describes anything that blocks light energy and does not allow light pass through it.

Question 8

Give an example of something opaque .

Answer 8

A piece of wood, metal

Question 9

Explain translucent.

Answer 9

A word that describes things which only partially block light, allowing some of it pass through.

Question 10

What is an example of something translucent?

Answer 10

sheer curtains, paper

Question 11

What is a shadow?

Answer 11

A dark area caused when light is blocked by an object.

Question 12

What is an optical illusion?

Answer 12

When things look different to us then they really are- like a broken pencil in a glass of water.

Question 13

What is a lens?

Answer 13

A special piece of glass or other transparent material that are shaped to bend or focus light, changing the way they look.

Question 14

What is a prism?

Answer 14

A special piece of glass that separates white light into all the colors of the rainbow.

Question 15

What is the acronym for the colors of the rainbow in the order of their appearance in the color spectrum? What does each letter stand for?

Answer 15

ROY G BIV - Red, Orange, yellow, Green, blue, indigo and Violet.

Question 16

What are the 2 types of light sources?

Answer 16

natural and artificial.

Question 17

What are some examples of natural light?

Answer 17

fireflies, fire, sun, lightning.

Question 18

What are some examples of artificial light?

Answer 18

flashlights, fireworks, light bulbs.

Question 19

What is natural light?

Answer 19

light sources that are not made by humans.

Question 20

What is artificial light?

Answer 20

light sources made by humans.

Question 21

What othe energy do light sources usually give off?

Answer 21

heat.

Question 22

What kind of lines does light travel in? What are these lines called?

Answer 22

straight lines called rays.

Question 23

Can light travel around corners?

Answer 23

no

Question 24

When an object is placed closely in front of a light source, what size is its shadow? Why?

Answer 24

larger, because it blocks a lot of light.

Question 25

When an object is placed far away from a light source, what size is it's shadow? Why?

Answer 25

smaller, because it blocks less rays of light.

Question 26

To make an evenly dark shadow, should you have a large or small light source?

Answer 26

small

Question 27

A shadow with fuzzy edges occurs when?

Answer 27

When the object is farther from where the shadow falls.

Question 28

A shadow with sharp edges occurs when?

Answer 28

When the ogject is close to where the shadow falls, such as on a wall.

Question 29

The middle, darker part of a shadow is called what?

Answer 29

umbra

Question 30

The lighter outside edges of a shadow is called what?

Answer 30

penumbra

Question 31

What is meant by luminous?

Answer 31

luminous is radiating or reflecting light.

Question 32

What is meant by illuminated?

Answer 32

Illuminated is to supply or brighten with light.

Question 33

What is the clear, tough outer coating that protects the eye called?

Answer 33

The cornea

Question 34

What is the colored part of the eye that controls the opening and closing of the pupil called?

Answer 34

The iris.

Question 35

What controls the amount of light that enters the eye by opening and closing called?

Answer 35

The pupil.

Question 36

What is the part of the eye that focuses the light that enters the eye called?

Answer 36

The lens

Question 37

What forms the back wall of the eye?

Answer 37

The retina

Question 38

What carries the message from the retina to the brain?

Answer 38

The optic nerve.

Question 39

Please label this eye:

Answer 39