Young Explorers: Investigating Our World · 1st Class

Active learning ideas

Light Absorption and Transmission

Active learning works well for this topic because children learn best by seeing light interact with materials themselves. Hands-on torch tests and filter explorations make abstract ideas about absorption and transmission concrete and memorable for young learners.

• NCCA Curriculum Specifications
• NCCA: Junior Cycle Science - Physical World
• NCCA: Junior Cycle Science - Waves and Light

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

Activity 01

• Stations Rotation
• 45 min · Small Groups

Stations Rotation: Material Testing Stations

Prepare stations with torches, transparent cups, opaque blocks, mirrors, and colored cellophane. Students predict if light passes through, then test and record with drawings. Rotate groups every 7 minutes, ending with a class share.

Explain why objects appear to have different colours.

Facilitation Tip

During Station Rotation, provide each group with a torch, a recording sheet, and a set of mixed materials to test at three labeled stations.

What to look for

Provide students with a selection of materials (e.g., plastic wrap, wax paper, cardboard, colored cellophane). Ask them to use a torch to test each material and sort them into three groups: transparent, translucent, and opaque. Observe their sorting and ask them to explain their reasoning for one material.

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

Activity 02

• Stations Rotation
• 25 min · Pairs

Pairs: Filter Color Hunt

Give pairs red, blue, green filters and white paper with markers. Shine torch through filters onto paper to mix colors, observe changes. Pairs note which colors appear and why.

Differentiate between materials that absorb, transmit, or reflect light.

Facilitation Tip

For Filter Color Hunt, give each pair a small torch and colored filters, then challenge them to match filters to colored objects around the room.

What to look for

Give each student a card with the question: 'If a red apple looks red, what must be happening to the other colors of light?' Ask them to draw a simple picture or write one sentence to show their understanding of light absorption and reflection.

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

Activity 03

• Stations Rotation
• 30 min · Whole Class

Whole Class: Light Box Demo

Build a simple box with one end open for torch, sides black paper, front clear plastic. Insert materials or filters, project on wall. Class predicts, observes, discusses as a group.

Analyze how filters change the colour of light that passes through them.

Facilitation Tip

In the Light Box Demo, dim the lights and slowly introduce each colored filter while asking students to observe changes in the light beam on the wall.

What to look for

Hold up a white piece of paper and shine a white torch beam on it. Then, place a colored filter (e.g., blue) in front of the torch. Ask students: 'What happened to the light? Why does the paper look blue now?' Facilitate a discussion about filters changing the light that passes through.

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

Activity 04

• Stations Rotation
• 20 min · Individual

Individual: Color Predictor Chart

Each child gets a chart of 10 objects, predicts absorb/transmit/reflect, tests with personal torch. They color code results and share one surprise.

Explain why objects appear to have different colours.

Facilitation Tip

Have students complete the Color Predictor Chart by predicting how different colored objects will appear under colored light before testing with torches and filters.

What to look for

Provide students with a selection of materials (e.g., plastic wrap, wax paper, cardboard, colored cellophane). Ask them to use a torch to test each material and sort them into three groups: transparent, translucent, and opaque. Observe their sorting and ask them to explain their reasoning for one material.

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

A few notes on teaching this unit

Teach this topic by building on children's everyday experiences with light and color. Avoid introducing complex terms like wavelength at this stage. Instead, focus on observable changes, such as how light changes when passing through a filter or why a red object looks red. Research shows that guided discovery with structured materials and clear questions helps children refine their ideas more effectively than open-ended exploration alone.

Successful learning looks like students confidently sorting materials by transparency, explaining how filters change light colors, and predicting why objects appear colored. They should use terms like absorb, reflect, and transmit when describing their observations.

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Watch Out for These Misconceptions

• During Material Testing Stations, watch for students thinking objects 'contain' their color like paint.

  Ask students to shine a torch through white and colored fabrics, then discuss why the white fabric reflects all colors while the colored fabric reflects only certain ones.

• During Filter Color Hunt, watch for students assuming transparent materials have no color.

  Have students hold colored filters up to their eyes and describe what they see, then test how the same filter changes the color of objects when placed in front of a torch.

• During Station Rotation, watch for students believing shadows prove light is blocked forever.

  Introduce small mirrors at one station to show how light can be redirected, then ask students to use mirrors to 'move' shadows from the Light Box Demo.

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Methods used in this brief

• Stations Rotation