Science · Grade 5

Active learning ideas

Light Energy and Its Properties

Active learning helps students grasp light’s properties by letting them see, touch, and manipulate materials. When students build a periscope or trace shadows with a ruler, they connect abstract ideas to concrete outcomes, making science feel immediate and real.

• Ontario Curriculum Expectations
• 4-PS4-2

• 25–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Experiential Learning
• 35 min · Pairs

Pairs: Mirror Periscope Build

Provide cardboard tubes, mirrors, and tape. Students cut slots, angle mirrors at 45 degrees inside tubes, and test with flashlights to see around corners. Discuss how reflection enables the view. Record angles that work best.

Explain how light travels in straight lines.

Facilitation Tip

During Mirror Periscope Build, remind pairs to align mirrors at exactly 45-degree angles so light bounces twice; use a protractor for accuracy.

What to look for

Provide students with a diagram showing a light ray hitting a mirror and another ray entering water. Ask them to label the processes occurring (reflection, refraction) and write one sentence describing what happens to the light in each case.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 02

• Experiential Learning
• 40 min · Small Groups

Small Groups: Refraction Water Bend

Fill clear glasses with water, add pencils or straws. Shine flashlights through sides to observe bending. Groups vary water levels or add oil layers, then draw light paths. Compare air versus water effects.

Compare how light behaves when it reflects off a mirror versus passing through water.

Facilitation Tip

For Refraction Water Bend, have small groups mark the cup’s edge where the straw appears broken, then measure the actual and apparent positions.

What to look for

Hold up various objects (e.g., a clear plastic cup, a wooden block, a frosted glass). Ask students to hold up a card labeled 'Transparent', 'Translucent', or 'Opaque' based on how light interacts with the object. Discuss their choices.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 03

• Experiential Learning
• 45 min · Whole Class

Whole Class: Absorption Heat Test

Expose black, white, and colored papers to sunlight or lamps for 10 minutes. Use thermometers to measure temperature rise. Class charts data and explains why dark absorbs more light energy.

Construct a device that demonstrates the principles of reflection or refraction.

Facilitation Tip

In Absorption Heat Test, circulate with an infrared thermometer to show temperature differences in less than two minutes.

What to look for

Pose the question: 'Imagine you are designing a periscope. What property of light is most important for its function, and why?' Facilitate a discussion where students explain their reasoning using vocabulary like reflection and straight-line travel.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 04

• Experiential Learning
• 25 min · Individual

Individual: Shadow Ray Tracer

Students use flashlights and rulers on paper to draw straight light paths and shadows of objects. Predict and test blockages, labeling reflection points on mirrors.

Explain how light travels in straight lines.

Facilitation Tip

During Shadow Ray Tracer, give students rulers to draw straight lines from flashlight to object, proving light travels in rays.

What to look for

Provide students with a diagram showing a light ray hitting a mirror and another ray entering water. Ask them to label the processes occurring (reflection, refraction) and write one sentence describing what happens to the light in each case.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

A few notes on teaching this unit

Use hands-on stations to contrast reflection and refraction; students often confuse the two until they see light bounce versus bend. Avoid relying solely on diagrams, as tactile experiences build lasting understanding. Research shows students grasp light’s behavior faster when they predict outcomes before testing them, so always ask for a hypothesis before each activity.

Students will explain light’s straight-line travel using shadow tests and ray tracing, describe reflection and refraction with mirrors and water, and compare heat absorption on dark versus light surfaces. Their conversations should include precise vocabulary like angle of incidence and medium change.

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Watch Out for These Misconceptions

• During Shadow Ray Tracer, watch for students who think light curves around objects.

  Have students use rulers to trace flashlight beams blocked by barriers, showing straight paths and sharp shadows. Ask them to explain why the beam stops instantly rather than bending.

• During Refraction Water Bend, listen for students saying the straw is broken because light bends in mirrors and water the same way.

  Use prisms and mirrors side by side at this station. Ask students to describe the difference between bouncing light (mirror) and bending light (water) using the words reflection and refraction.

• During Mirror Periscope Build, expect some students to say mirrors absorb light to create images.

  Ask groups to shine a flashlight into the periscope and trace the light’s path with their fingers. Emphasize that mirrors send light back out, creating clear images without absorption.

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Methods used in this brief

• Experiential Learning