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Opening

BUILD · SCIENCE · Lesson 5 of 10

Does bright mean source?

Learning intention

Distinguish objects that give out their own light from surfaces that reflect light.

A mirror looks bright.

A lamp looks bright.

Did their light start in the same place?

Success looks like

  • Use evidence to classify a source or reflector.
  • Explain how a non-glowing object can be seen.
  • Recognise reflection from both mirrors and ordinary surfaces.
Retrieval

BUILD · SCIENCE · Lesson 5 of 10

Follow the light

1. What do we need to see?

2. Does light enter the eye?

3. Does an unlit plain card glow?

I do

BUILD · SCIENCE · Lesson 5 of 10

I ask where the light began

The lit lamp gives out light.

The card receives light.

It reflects some of that light.

Make light or reflect it?A lit lamp gives out its own visible light. A non-luminous card reflects some light arriving from that lamp. Both can be seen when light reaches an eye.Lit lampWhite cardSource: gives outits own light.Reflector: returns somelight that reaches it.
Make light or reflect it?
Diagram description

A lit lamp gives out its own visible light. A non-luminous card reflects some light arriving from that lamp. Both can be seen when light reaches an eye.

I do

BUILD · SCIENCE · Lesson 5 of 10

A mirror redirects light

Light reaches the mirror.

Reflected light reaches the screen.

Switching off removes this source.

A mirror changes the light directionA ray travels down and right onto a horizontal mirror, then up and right towards a screen; incident and reflected angles are equal in this schematic.LED lightFlat mirrorScreenreceives lightThe mirror reflects light; it does not make the light.
A mirror changes the light direction
Diagram description

A ray travels down and right onto a horizontal mirror, then up and right towards a screen; incident and reflected angles are equal in this schematic.

I do

BUILD · SCIENCE · Lesson 5 of 10

Paper reflects too

Paper need not look shiny.

Some reflected light reaches us.

Ordinary paper reflects light tooA source ray reaches a rough paper surface; reflected rays leave in several directions. This is a schematic of diffuse reflection, not a ray traced from one perfectly flat point.LED lightWhite paperReflected lightin manydirectionsA clear mirror image is not needed for reflection.
Ordinary paper reflects light too
Diagram description

A source ray reaches a rough paper surface; reflected rays leave in several directions. This is a schematic of diffuse reflection, not a ray traced from one perfectly flat point.

Continue within this stage’s shared time.

We do

BUILD · SCIENCE · Lesson 5 of 10

Sort the evidence cards

Go to interactive investigation

Read A–F.

Choose source or reflector.

Give a clue, then swap roles.

Constructed teaching evidence
CardStated case
ALit LED lamp; gives out light
BMoon; lit by sunlight
CPhone screen on; emits light
DMirror; returns arriving light
EFirefly; produces its own light
FWhite paper; lit by room light

W1. Which three are sources?

Source or reflector: evidence challenge

Make a choice, test it against the stated evidence, then trace where the light began.

Decision 1 of 3

Card A is a switched-on LED lamp. How is it supplying light?

Choose, test, then explain together. Evidence diagrams appear only after your test. Diagram transitions explain the model; they do not represent real elapsed time. Use Pause model to stop transitions and model controls, or your device’s reduced-motion setting. The printed We do activity provides the paper route.

We do

BUILD · SCIENCE · Lesson 5 of 10

The switch-off challenge

The phone screen is now off.

Room light still reaches it.

Can it be visible? Why?

W2. How does switching off change our account?

Hinge

BUILD · SCIENCE · Lesson 5 of 10

Which statement works?

Choose one and give a reason.

You do

BUILD · SCIENCE · Lesson 5 of 10

Choose your investigation route

Match source or reflector.

Write a display label.

Repair a sorting rule.

You do

BUILD · SCIENCE · Lesson 5 of 10

Use the evidence

Read or point to one clue.

Record what it supports.

Keep your explanation short.

Continue within this stage’s shared time.

You do

BUILD · SCIENCE · Lesson 5 of 10

Make your own science record

Complete your chosen route.

Use a diagram, words or speech.

Check one answer with the evidence.

You do

BUILD · SCIENCE · Lesson 5 of 10

Check and improve

Does my answer match the evidence?

Have I explained why?

Improve one label or sentence.

Continue within this stage’s shared time.

Review

BUILD · SCIENCE · Lesson 5 of 10

Lundy loop: improve our account

Choose how to share one idea.

Listen to another explanation.

Use evidence to improve our account.

How should we replace “bright means source”?

Exit

BUILD · SCIENCE · Lesson 5 of 10

Three quick checks

E1. What is a light source?

E2. Does ordinary paper reflect light?

E3. Does the Moon make the sunlight we see from it?

My science task sheets

Choose one route with your teacher. Shared evidence and the exit sheet appear in every route. Your work stays here while the page is open; save it before closing.

Evidence: six light cases

Constructed teaching cards. Classify the stated case.

A • Lit LED lamp

The switched-on LED gives out visible light.

B • Moon

Sunlight reaches the Moon. Some is reflected towards Earth.

C • Phone screen on

The working display gives out visible light.

D • Mirror

Room light reaches the mirror and is reflected.

E • Firefly

This insect produces light through a chemical reaction in its body.

F • White paper

A lamp lights the ordinary paper. The paper reflects some light.

Route 1 • Sort and explain

Word bank: source / reflects / light / eye.

S1. Card A is a __.
S2. Card D __ light from the room.

Route 2 • Make a display label

Use the card evidence, not brightness or shine.

TaskCardSource or reflector?
T1A
T1B
T1C
T1D
T1E
T1F

Route 3 • Challenge the rule

A display says: “If it shines, it must be a source.”

Exit and reflection

Point, draw, write or tell an adult.

Slide 1

TA Brief

Current stage

Objective

Distinguish objects that give out their own light from surfaces that reflect light.

Preparation

Method precautions

Practical alternative

Sort the six supplied cases and trace the supplied mirror and paper diagrams; no practical is needed.

Access and regulation

Supported: Choose one route: short choices, word bank and pointing or adult-scribed explanation; keep the same science goal.

Standard: Use the evidence provided to record a decision and explain the science in short sentences.

Stretch: Apply the same core idea to a changed setup, identify a limitation and justify a better decision.

Regulation: Preview the sequence and equipment. Offer seated observation, a quiet paper route, partner rehearsal and a pass. Never require public performance or a darkened room.

Teacher answers

Retrieval 1–3

Light; light enters the eye; ordinary unlit card does not glow.

We do W1–W2

W1 A, C and E sources; B, D and F reflectors. W2 an off screen can reflect room light although it no longer emits display light.

Hinge

Third option correct. Mirrors do not create the reflected light; reflection also occurs at non-shiny surfaces.

S1–S5

S1 source. S2 reflects. S3 B and F reflectors. S4 source light reaches paper and some reflected light enters the eye. S5 firefly.

T1–T3

T1 A source; B reflector; C source; D reflector; E source; F reflector. T2 mirror returns some arriving light towards the eye. T3 arrows from source to paper and from paper towards eye.

X1–X4

X1 the bright mirror reflects light. X2 ask whether the object gives out its own light in this stated condition. X3 on screen emits display light and can also reflect; off screen can still reflect room light. X4 no: with no incoming light it cannot illuminate the box.

Exit E1–E3

E1 gives out its own light. E2 yes. E3 no, it reflects sunlight.

R1–R2

Responses vary. Credit a science-related revision or relevant next question. A pass or private response is acceptable; preferences have no fixed right answer.

Sources checked for this lesson

Word help

source
Something that gives out its own light.
reflection
Light returning from a surface.
surface
The outside of an object.

Cold Call

Give thinking time. Invite a response by voice, pointing or showing work. A pupil can pass; check in privately when useful.

Pause

Take a quiet pause.

You can look away from the screen. Come back when you are ready.

The lesson and your work are still here. Close this box to return.

Lesson tools

Choose a slide or a print route.

Teacher Print Tools

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