You will learn
- Define light source.
- Sort sources from non-sources.
- Compare natural and artificial sources.
- Explain how we see things.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
Words to know
something that makes its own light
found in nature
made by people
to bounce light back
1. Discover: The night walk
Kofi walks home at dusk. He sees the Sun setting, then the Moon rising and street lamps flickering on. “Which ones make their own light?” his sister asks. Kofi thinks. “The Sun and the lamps do. The Moon only shines because of the Sun.”
Think: Which of these are natural sources?
2. Understand: Light sources
Idea 1: Making light
A light source makes its own light. The Sun, stars, fire, lightning and fireflies are natural sources. Torches, lamps and phone screens are artificial.
Idea 2: Not sources
The Moon, mirrors, books and clothes are not sources. They only reflect light from a source. In a dark room we cannot see them.
Idea 3: How we see
We see a source when its light enters our eyes. We see other objects when light from a source bounces off them into our eyes.
3. Worked examples
Example 1 (I show you): Sort
Sun.
- Makes light.
- Natural.
- Source.
Answer: The Sun is a natural source.
Example 2 (We do it together): Sort
Moon.
- Reflects sunlight.
- No own light.
- Not a source.
Answer: The Moon is not a light source.
Example 3 (You try): Sort
Torch.
Show the steps and answer
- Makes light.
- Made by people.
- Artificial.
Answer: A torch is an artificial source.
Did you know?
Light from the Sun takes about eight minutes to reach Earth, travelling at around 300,000 kilometres every second.
Why this matters
Light lets us see and gives energy to plants.
4. Explore: Source sort
Sort pictures of ten objects into light sources and non-sources.
- Look at each picture.
- Decide if it makes its own light.
- Sort into two groups.
- Explain two choices.
Think about it: what did you notice?
What did you notice? Many bright things were only reflecting.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- A ___ source makes its own light.
- The ___ is our main natural source.
- A lamp is an ___ source.
- The Moon ___ sunlight.
Guided practice
Question 1. What is a light source?
Makes own light.
Question 2. Name a natural source.
Sun.
Question 3. Name an artificial source.
Torch.
Independent practice
Level 1: Start
- What is a light source?
- Name a natural source.
- Name an artificial source.
- Is the Moon a source?
- How do we see?
Level 2: Grow
- Why is the Moon bright?
- Why can we not see in the dark?
- Why do plants need light?
Level 3: Stretch
- Sort ten objects.
- Draw light reaching eyes.
- Explain the Moon.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Name five light sources you use.
Show a sample answer
Natural or artificial.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: It reflects.
Fix: They reflect.
8. Lesson summary and revision card
- I can define light source.
- I can sort sources from non-sources.
- I can compare natural and artificial sources.
- I can explain how we see things.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- Light sources make their own light.
- The Sun is our main natural source.
- Lamps and torches are artificial sources.
- The Moon only reflects sunlight.
11. Next lesson
Next lesson: Light travelling in straight lines. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- Define light source. [2 marks]
- Sort four objects into sources and non-sources. [4 marks]
- Explain why we can see the Moon. [3 marks]
- Safety rule? [1 mark]
Total: 10 marks.
Marking guide and model answers
- Makes its own light [1]; example [1]
- 1 each
- Sun is the source [1]; Moon reflects [1]; light enters eyes [1]
- Any [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- What is a light source?
- Name a natural source.
- Name an artificial source.
- Is the Moon a source?
- How do we see?
- Why is the Moon bright?
- Why can we not see in the dark?
- Why do plants need light?
- Sort ten objects.
- Draw light reaching eyes.
Homework
Find five light sources at home and say whether each is natural or artificial.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is a light source? | Makes own light. | 1 |
| 2. Name a natural source. | Sun. | 1 |
| 3. Name an artificial source. | Torch. | 1 |
| 4. Is the Moon a source? | No. | 1 |
| 5. How do we see? | Light enters eyes. | 1 |
| 6. Why is the Moon bright? | Reflects. | 1 |
| 7. Why can we not see in the dark? | No source. | 1 |
| 8. Why do plants need light? | Make food. | 1 |
| 9. Sort ten objects. | Table. | 1 |
| 10. Draw light reaching eyes. | Diagram. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Makes own light.; 2 Sun.; 3 Torch.; 4 No.; 5 Light enters eyes.. Level 2: 1 Reflects.; 2 No source.; 3 Make food.. Level 3: 1 Table.; 2 Diagram.; 3 Sentence..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Define light source | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Sort sources from non-sources | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Compare natural and artificial sources | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Explain how we see things | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “The Moon makes its own light.” It reflects.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Sort light sources and explain seeing.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child learns about light sources. You do not need to be an expert to help.
- Spot sources at dusk.
- Ask “Source or reflector?”
- Never look at the Sun.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: define light source; sort sources from non-sources; compare natural and artificial sources; explain how we see things.
Prerequisite knowledge. Grade 3 physical ideas: forces, materials, and how to measure and record in fair tests.
Materials. Pictures, notebooks. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Print object pictures.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Switch off the lights and ask, “What can we see?”
Explanation (10 min). Teach light sources.
Guided activity (10 min). Learners sort.
Independent activity (10 min). Learners explain.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. Does it make light or reflect it?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “The Moon makes its own light.” It reflects.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Sort light sources and explain seeing. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 4 Unit 4, topic 1; Next Generation Science Standards, waves and their applications (light); Cambridge Primary Science Stage 4, physics: light and dark; IB Primary Years Programme, how the world works. These sources informed the lesson.