You will learn
- Define transparent, translucent and opaque.
- Test materials with a torch.
- Sort materials.
- Link properties to uses.
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
- Transparent materials let us see clearly.
- Translucent materials let some light through.
- Opaque materials block light and make shadows.
- We choose materials by their light properties.
Words to know
lets almost all light through, so we see clearly
lets some light through, but we cannot see clearly
lets no light through
what something is made of
1. Discover: The classroom window
Mr Kuffour holds up a sheet of clear plastic, a sheet of tracing paper and a piece of card in front of a torch. The plastic shows everything. The tracing paper makes a blur. The card makes a dark shadow. “Three different materials, three different results,” he says.
Think: Which material blocked all the light?
2. Understand: Seeing through materials
Idea 1: Transparent
Transparent materials like clear glass and clear plastic let light pass so we see clearly through them.
Idea 2: Translucent
Translucent materials like tracing paper and frosted glass let some light through, but images look blurred.
Idea 3: Opaque
Opaque materials like wood, card and metal block light and make dark shadows.
3. Worked examples
Example 1 (I show you): Sort
Glass, tracing paper, card.
- Glass: transparent.
- Paper: translucent.
- Card: opaque.
Answer: Three groups.
Example 2 (We do it together): Use
A window.
- See through.
- Let in light.
- Transparent.
Answer: Windows are transparent.
Example 3 (You try): Use
A bathroom window.
Show the steps and answer
- Light but privacy.
- Frosted.
- Translucent.
Answer: Frosted glass is translucent.
Did you know?
Some modern windows change from clear to dark at the touch of a button.
Why this matters
The right choice of material gives light, privacy and shade.
4. Explore: Torch test
Test materials with a torch and screen.
- Hold each material before a torch.
- Look at the screen.
- Sort by how much light passes.
- Record in a table.
Think about it: what did you notice?
What did you notice? Some passed light, some did not.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- Transparent lets ___ light through.
- ___ blocks all light.
- ___ lets some light.
- A window is ___.
Guided practice
Question 1. What is transparent?
Lets light through clearly.
Question 2. What is opaque?
Blocks light.
Question 3. What is translucent?
Lets some light through.
Independent practice
Level 1: Start
- What is transparent?
- What is opaque?
- What is translucent?
- Is glass transparent?
- Is wood opaque?
Level 2: Grow
- Why use clear glass?
- Why use frosted glass?
- Why are curtains opaque?
Level 3: Stretch
- Test five materials.
- Explain uses.
- Design a window.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
What transparent things are near you?
Show a sample answer
Windows and bottles.
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: Plastics too.
Fix: Different.
8. Lesson summary and revision card
- I can define transparent, translucent and opaque.
- I can test materials with a torch.
- I can sort materials.
- I can link properties to uses.
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
- Transparent materials let us see clearly.
- Translucent materials let some light through.
- Opaque materials block light and make shadows.
- We choose materials by their light properties.
11. Next lesson
Next lesson: Sources of sound. 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 transparent, translucent, opaque. [3 marks]
- Give an example of each. [3 marks]
- Describe a test. [3 marks]
- Why use frosted glass? [1 mark]
- Safety rule? [1 mark]
Total: 11 marks.
Marking guide and model answers
- Three definitions [1 each]
- Three examples [1 each]
- Torch [1]; materials [1]; sort [1]
- Light and privacy [1]
- Do not shine in eyes [1]
Score guide: 10 to 11 = secure. 7 to 9 = nearly there, revise the parts you missed. Under 7 = work through the lesson again with a grown-up.
Printable worksheet
- What is transparent?
- What is opaque?
- What is translucent?
- Is glass transparent?
- Is wood opaque?
- Why use clear glass?
- Why use frosted glass?
- Why are curtains opaque?
- Test five materials.
- Explain uses.
Homework
Find two transparent, two translucent and two opaque things at home.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is transparent? | Lets light through clearly. | 1 |
| 2. What is opaque? | Blocks light. | 1 |
| 3. What is translucent? | Lets some light through. | 1 |
| 4. Is glass transparent? | Yes. | 1 |
| 5. Is wood opaque? | Yes. | 1 |
| 6. Why use clear glass? | To see out. | 1 |
| 7. Why use frosted glass? | Privacy and light. | 1 |
| 8. Why are curtains opaque? | Block light. | 1 |
| 9. Test five materials. | Table. | 1 |
| 10. Explain uses. | Properties and use. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Lets light through clearly.; 2 Blocks light.; 3 Lets some light through.; 4 Yes.; 5 Yes.. Level 2: 1 To see out.; 2 Privacy and light.; 3 Block light.. Level 3: 1 Table.; 2 Properties and use.; 3 Plan..
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 transparent, translucent and opaque | 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 Test materials with a torch | 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 Sort materials | 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 Link properties to uses | 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: “All clear things are glass.” Plastics too.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Sort six materials by how they affect light.
- 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 tests which materials let light through. You do not need to be an expert to help.
- Look through different materials.
- Ask, “What can you see?”
- Make a table.
- 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 transparent, translucent and opaque; test materials with a torch; sort materials; link properties to uses.
Prerequisite knowledge. Grade 1 ideas: light and shadows, sounds around us and what makes sound.
Materials. Torches, clear plastic, tracing paper, card, foil and tables. 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. Cut samples. Prepare a screen. Prepare tables.
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). Hold up a clear plastic sheet and ask, “Can you see through it?”
Explanation (10 min). Teach three types.
Guided activity (10 min). Learners test.
Independent activity (10 min). Learners sort.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. Does light pass? How clearly?
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. “All clear things are glass.” Plastics too.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 11-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 six materials by how they affect light. 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 2 Unit 9, topic 3; Next Generation Science Standards, waves and energy (1-PS4 light and sound foundations); Cambridge Primary Science Stage 2, light, sound and energy; IB Primary Years Programme, how the world works. These sources informed the lesson.