Science · Year 6 · Light and Sight · Spring Term

Shadow Play

Investigating how the position of a light source affects the size and shape of shadows.

• National Curriculum Attainment Targets
• KS2: Science - Light

About This Topic

Shadow play explores how shadows form and change based on light source position. Year 6 students use torches or lamps to cast shadows of everyday objects onto screens or walls. They observe that shadows grow larger when the light moves closer to the object and shrink when farther away. Shape distortions occur as light angles shift, helping students grasp that light travels in straight lines and shadows result from blocked rays.

This topic fits within the Light and Sight unit of the KS2 Science curriculum. It develops prediction skills, as students forecast shadow changes before testing, and analytical thinking through measuring shadow lengths at varying distances. Recording data in tables strengthens scientific method practices, while group discussions refine explanations.

Active learning shines here because students directly manipulate variables like light distance and object position. Building shadow puppets or tracking shadows outdoors turns abstract ray diagrams into concrete experiences. These methods boost retention, as pupils connect classroom models to real-world sights like elongated shadows at sunset.

Key Questions

1. Analyze the relationship between light source position and shadow characteristics.
2. Predict how moving a light source will alter a shadow.
3. Construct a model to demonstrate shadow formation.

Learning Objectives

• Analyze the direct relationship between the distance of a light source from an object and the resulting shadow's size.
• Predict the shape and dimensions of a shadow when the angle of the light source relative to an object is changed.
• Construct a simple model using a light source, object, and screen to demonstrate how light travels in straight lines to form shadows.
• Compare the characteristics of shadows cast by different shaped objects under the same lighting conditions.
• Explain why shadows change size and shape as the light source moves.

Before You Start

Properties of Light

Why: Students need to know that light travels in straight lines to understand how shadows are formed.

Observation and Recording

Why: The ability to carefully observe changes in shadow size and shape and record these observations is fundamental to the investigation.

Key Vocabulary

Opaque	An object that does not allow light to pass through it, therefore casting a shadow.
Light Source	Anything that emits light, such as a torch, lamp, or the sun.
Shadow	A dark area formed when an opaque object blocks light rays traveling in straight lines.
Umbra	The darkest, central part of a shadow where the light source is completely blocked.

Watch Out for These Misconceptions

Common Misconception

Shadows are always the same size as the object.

What to Teach Instead

Shadows enlarge when light is close and shrink when far, as light rays spread out. Hands-on measuring at stations lets students quantify this, replacing fixed-size ideas with distance-based understanding through peer comparison.

Common Misconception

Light curves around objects to make fuzzy shadows.

What to Teach Instead

Shadows form sharp edges because light rays travel straight; fuzziness comes from multiple or extended sources. Testing single torch vs. room lights in pairs reveals ray paths, with sketches clarifying straight-line travel.

Common Misconception

Shadows only form with sunlight.

What to Teach Instead

Any light source blocks to create shadows; artificial lights mimic sun effects. Classroom torch experiments show identical principles, building confidence in predictions across contexts via group testing.

Active Learning Ideas

Stations Rotation: Shadow Variables

Prepare four stations with torches at fixed distances from objects: close, medium, far, angled. Groups spend 7 minutes at each, measuring shadow length and sketching shapes, then rotate. Conclude with a class chart comparing results.

45 min·Small Groups

Pairs Prediction Challenge: Moving Light

Partners choose an object and predict shadow changes as one holds the torch closer or farther. Test predictions, measure with rulers, and record in a shared notebook. Discuss why predictions matched or differed.

30 min·Pairs

Whole Class: Shadow Model Build

Provide card, torches, and screens. Class collaboratively builds a large shadow scene, adjusting light to create giant or distorted figures. Narrate observations as a group story.

35 min·Whole Class

Individual: Outdoor Shadow Tracker

Each student marks a stick's shadow hourly outside, noting length and direction changes due to sun position. Plot data on personal graphs for later class share.

50 min·Individual

Real-World Connections

• Stage lighting designers use their understanding of light sources and shadows to create dramatic effects and illuminate actors on a theatre stage, controlling the size and position of shadows for artistic impact.
• Architects and urban planners consider how buildings and structures cast shadows on public spaces and neighboring properties, influencing sunlight exposure and the design of parks and plazas.
• Astronomers observe the shadows cast by celestial bodies, such as lunar eclipses where the Earth casts a shadow on the Moon, to understand planetary movements and distances.

Assessment Ideas

Quick Check

Provide students with a worksheet showing an object and a light source. Ask them to draw the resulting shadow. Then, ask them to draw how the shadow would change if the light source moved closer, farther away, or higher up. Check for accurate representation of shadow size and position.

Exit Ticket

Give each student a small object and a mini-torch. Ask them to create a shadow on a piece of paper. On their exit ticket, they should write two sentences: one explaining how they made the shadow, and one predicting what would happen to the shadow if they moved the torch further away from the object.

Discussion Prompt

Pose the question: 'Imagine you are trying to make the longest shadow possible with a toy car and a lamp. Where would you place the lamp relative to the car and the wall?' Facilitate a class discussion where students explain their reasoning using terms like 'distance' and 'angle'.

Frequently Asked Questions

What activities teach shadow formation in Year 6?

Use torch stations where students vary light distance to objects and measure shadows. Pairs predict changes before testing, while outdoor tracking links to sun position. These build prediction and data skills aligned to KS2 Light standards, with models reinforcing straight-line travel.

How does light position affect shadows?

Closer light sources create larger shadows as rays diverge more; farther ones produce smaller, sharper ones. Angled positions distort shapes. Students investigate this by positioning torches systematically, recording lengths to plot relationships and explain via ray diagrams.

Common misconceptions about shadows for KS2?

Pupils often think shadows match object size or form only from sun. Correct through experiments showing distance effects and torch demonstrations. Active measurement and discussion shift mental models, as groups quantify changes and share evidence.

How can active learning improve shadow play lessons?

Manipulating torches and objects firsthand lets students see cause-effect instantly, like giant shadows from close lights. Group rotations and predictions engage all, fostering talk and data analysis. This beats passive diagrams, as tangible tests build lasting grasp of light rays and boost confidence in scientific explanations.