Science (EVS K-5) · Class 4

Active learning ideas

Light: Sources and Shadows

Light and shadows come alive when students move beyond textbooks and engage with materials directly. By handling torches, slits, and objects, children see how light behaves, making abstract ideas like rectilinear propagation and shadow formation concrete and memorable for their age group.

• CBSE Learning Outcomes
• NCERT: Science - Light - Class 4

• 20–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Stations Rotation
• 45 min · Small Groups

Stations Rotation: Shadow Properties

Prepare four stations with torches at varying distances from objects like toys or cutouts on white sheets. Groups rotate every 10 minutes, draw shadows, measure lengths, and note shape changes. Conclude with a class chart comparing results.

Explain how light travels in straight lines and how this property creates shadows.

Facilitation Tip

During Station Rotation: Shadow Properties, set up multiple stations so groups rotate every 8-10 minutes, ensuring all students handle materials and record observations.

What to look for

Present students with images of various objects (e.g., Sun, candle, mirror, electric bulb, tree, book). Ask them to sort these into two columns: 'Natural Light Sources' and 'Artificial Light Sources'. Review their classifications together.

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Activity 02

• Experiential Learning
• 25 min · Pairs

Pairs Experiment: Light Sources

Pairs list five natural and five artificial light sources, then test three artificial ones with objects to form shadows. They record if shadows differ by source brightness. Share findings in a whole-class tally.

Differentiate between natural and artificial sources of light.

Facilitation Tip

For Pairs Experiment: Light Sources, provide only one set of materials per pair to encourage discussion and shared problem-solving.

What to look for

Give each student a worksheet with a simple diagram showing a light source, an opaque object, and a screen. Ask them to draw the shadow formed and write one sentence explaining why the shadow appeared.

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

Activity 03

• Experiential Learning
• 30 min · Whole Class

Whole Class Demo: Rectilinear Path

Darken the room, use a torch to shine light through cardboard slits in a row. Students predict and observe if light bends or stays straight onto a screen. Discuss why no light appears around blocks.

Analyze how the position of a light source affects the size and shape of a shadow.

Facilitation Tip

In Whole Class Demo: Rectilinear Path, dim the lights fully so students see the light beam clearly through the slit card without any ambient interference.

What to look for

Ask students: 'Imagine you are standing outside at noon and then again at 4 PM. How does the shadow of a tree change? What property of light explains this change?' Facilitate a class discussion to guide them towards rectilinear propagation and the changing angle of the sun.

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

Activity 04

• Experiential Learning
• 20 min · Individual

Individual Tracing: Outdoor Shadows

Each student selects a stick or toy outdoors, traces its shadow at two times an hour apart, and measures changes. They sketch the sun's position and explain size differences in notebooks.

Explain how light travels in straight lines and how this property creates shadows.

Facilitation Tip

For Individual Tracing: Outdoor Shadows, bring metre sticks and chalk so students measure lengths precisely and label their diagrams carefully.

What to look for

Present students with images of various objects (e.g., Sun, candle, mirror, electric bulb, tree, book). Ask them to sort these into two columns: 'Natural Light Sources' and 'Artificial Light Sources'. Review their classifications together.

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

A few notes on teaching this unit

Teachers should avoid explaining light’s behaviour before hands-on trials, as early exposure to theory can overshadow discovery. Instead, let students test predictions first, then introduce terms like ‘rectilinear propagation’ after they observe the pattern. Research shows that guided inquiry—where teachers ask ‘What do you see?’ before ‘Why does it happen?’—builds stronger conceptual foundations in primary science.

Students will confidently explain that light travels in straight lines, identify sources as natural or artificial, and predict how shadow size changes with light position. Success looks like accurate sketches, clear explanations, and thoughtful predictions shared with peers.

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Watch Out for These Misconceptions

• During Whole Class Demo: Rectilinear Path, watch for students who say light bends around corners or objects.

  Use the slit card and torch in the demo: ask students to predict if light will leak around a book placed in its path, then test it. When no leakage occurs, guide them to conclude that light travels only in straight lines.

• During Station Rotation: Shadow Properties, watch for students who assume shadows are always the same size as the object.

  Have students measure shadow lengths at three distances (10 cm, 20 cm, 30 cm) and record data in a table. Ask them to compare sizes and explain how closer lights make larger shadows using their measurements.

• During Pairs Experiment: Light Sources, watch for students who classify all glowing things as natural light sources.

  Ask pairs to create two lists: one for objects that glow naturally and one for those that glow artificially. After testing both sun and bulb, have them share lists to see that both create shadows similarly, but origins differ.

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Methods used in this brief

• Stations Rotation
• Experiential Learning