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Unit 4 · Light Energy1 / 14
MISSION 2

Light Explorer

How does light travel? How is a shadow made?
Welcome back, Explorer! Today we follow the light
and hunt for shadows. Are you ready?
Explorer's name:
How to play
1. Read what Glow says on each page.
2. Do the mission under it.
3. Win 3 badges. Colour each badge when you win it!
Shadow Hunter
Shadow Detective
Light Scientist
Light Explorer · Mission 22 / 14

Remember Mission 1?

Quick-fire time! Show me what you remember about sources of light.
Fill in the blank.

A source of light gives out light of its .

Circle the three sources of light.
the Moonlightninga mirrorfireworksa torch that is onglitter
Which group? Write Fire, Electricity or Nature.
1.stage lights
2.krill
3.a camp fire
Why is the Sun the most important source of light?
Light Explorer · Mission 23 / 14

Straight or wiggly?

Last time you made a guess. Here is the answer! Light travels in a straight line away from its source.
Look at the sunlight between the trees. Circle the correct word.
  1. The light makes straightwiggly lines.
  2. Light travels towardsaway from its source.
What do you notice about the sunlight in the picture?
Light Explorer · Mission 24 / 14

Rays and arrows

Scientists draw light as a straight line called a ray. The arrow shows the direction the light travels.
Which picture shows light the right way? Circle it.
A
B
C
D
Ray drawing. Use a ruler. Draw four rays coming out of the lamp. Add arrows.
Fill in the blank.

The arrow on a ray shows the of the light.

Light Explorer · Mission 25 / 14

Light can't turn corners

Light cannot bend around things. If something is in the way, the light is blocked.
Glow looks through two straws at a lamp. Through which straw can Glow see the light?
AB

Glow can see the light through straw AB.

The lamp shines at three shapes. Use a ruler. Which shape does NOT get any light?
ABC

Shape does not get any light.

Why can't the light reach that shape?
Light Explorer · Mission 26 / 14

What is a shadow?

Light cannot pass through an opaque object. When an opaque object blocks light, a dark area forms behind it. This dark area is a shadow.
123
Label the picture. Use the words in the box.
shadow · light source · opaque object

1   2   3

Fill in the blanks.

A shadow is formed when light is by an object.

Where does the shadow form? Circle the correct word.

The shadow forms in front ofbehind the object, on the side away from the light.

Light Explorer · Mission 27 / 14

Shadow shapes

A shadow has the same shape as the outline of the object. When the object moves, its shadow moves too!
Match each object to its shadow. Write the letter.
1. a.
2. b.
3. c.
4. d.
In a shadow puppet show, the puppet is between a lamp and a screen. What do people see on the screen? Why?
Light Explorer · Mission 28 / 14

Which side?

A shadow is always on the opposite side from the light. Light comes from one side, so the shadow falls on the other side.
Shadow drawing. Draw the shadow in each picture.
Circle the correct word.

A shadow is on the sameopposite side from the light.

Mali stands with the Sun behind her. Where is her shadow?
If you walk towards the Sun, can you see your shadow? Why?
Light Explorer · Mission 29 / 14

The Sun moves, the shadow changes

The Sun moves across the sky during the day. In the morning and afternoon, the Sun is low and shadows are long. At midday, the Sun is high and shadows are short.
In these pictures, the Sun rises on the left. Draw the shadow. Then write morning, midday or afternoon.
A
B
C
Circle the correct words.
  1. In the morning, the Sun is highlow and my shadow is longshort.
  2. At midday, the Sun is lowhigh and my shadow is shortlong.
Why does your shadow point one way in the morning and the other way in the afternoon?
Light Explorer · Mission 210 / 14

Big shadow, small shadow

The size of a shadow depends on where the light is. Move the light closer to the object, and the shadow gets bigger. Move the light farther away, and the shadow gets smaller.
In which picture will the shadow on the wall be bigger? Circle it.
A
B
Fill in the blanks.

When the light moves closer to the object, the shadow gets .

When the light moves farther away, the shadow gets .

Glow wants to make a giant shadow of himself on the wall. What should he do with the torch?
Light Explorer · Mission 211 / 14

Shadow Hunter

Careful, Explorer! Some of these are tricks. Get 7 or more right to win your first badge!
Circle True or False.
1.Light travels in a straight line.TrueFalse
2.Light can bend around a wall.TrueFalse
3.A shadow is on the same side as the light.TrueFalse
4.A shadow forms when light is blocked.TrueFalse
5.At midday, your shadow is very long.TrueFalse
6.A shadow has the same shape as the outline of the object.TrueFalse
7.When you move, your shadow moves too.TrueFalse
8.A red ball makes a red shadow.TrueFalse
Shadow Hunter
My score: / 8
7 or more? Colour your badge on page 1!
Light Explorer · Mission 212 / 14

Shadow Detective

Detective time! Look at each shadow. Where is the light? Then read the clues and solve the mystery words.
Look at the shadow. Draw the Sun where it should be.
Who am I?
1.“I am dark. I appear when light is blocked.”
2.“Light cannot pass through me.”
3.“I am a straight line that shows the path of light.”
4.“I move across the sky, so shadows change during the day.”
Shadow Detective
All correct?
Colour your badge on page 1!
Light Explorer · Mission 213 / 14

Book Challenge

These are the big questions you will meet at school. Answer in full sentences to win your third badge!
Question 1

How does light travel?

Question 2

How are shadows formed?

Question 3

Why does your shadow change during the day?

Light Scientist
Finished? Colour your last badge on page 1!
Light Explorer · Mission 214 / 14

Mixed challenge

Last page! Here is the boss question. Then get ready for your next mission.
Fill in the blank.

Light cannot pass through an object.

Ploy's shadow is very short. What time of day is it?
Boss question! If light could bend around objects, would there still be shadows? Explain.