Shadows and Materials

Shadows and Materials

What students learn

Students learn how different materials let light through, block light, or do a little of both. Start with Transparent Objects Let Light Pass Through to name the first material type.

Why it matters

Understanding transparent and opaque materials helps students predict shadows and choose the right material for a job. Opaque Objects Block Light and Make Shadows shows why some objects cast stronger shadows than others.

Learn the idea

Transparent materials let most light pass through. Opaque materials block light. A simple investigation can compare the two. Simple Investigation with Shadows and Materials shows how to test ideas with light and everyday objects.

Try it

Collect a clear cup, a piece of paper, and a cardboard piece or book. Hold each item in front of a light source and ask the student which one makes the darkest shadow and which one lets the most light through.

Parent guide

If possible, let the child move the materials themselves and describe what they observe. Ask them to use the words transparent and opaque in full sentences. If they are ready, add translucent as a middle case and compare all three.