Opaque, transparent and translucent

I can compare different materials based on how transparent they are.

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Opaque, transparent and translucent

I can compare different materials based on how transparent they are.

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Lesson details

Key learning points

Materials can be compared and classified according to how much light can pass through them.
Opaque materials do not let light pass through them.
Transparent materials allow light through so objects can clearly be seen through them.
Translucent materials allow some light to pass through but are not completely see-through.

Keywords

Materials - A material is what an object is made from. An object can be made from more than one material.
Classify - To classify is to sort objects into groups.
Opaque - Light cannot pass through objects that are opaque.
Transparent - Transparent materials are completely see-through.
Translucent - Translucent materials allow some light to pass through but are not completely see-through.

Common misconception

All materials that let light through them are transparent.

Explanation of the difference between materials that are transparent and those that are translucent.

When testing materials, make the room as dark as possible so children can see whether light is passing through each material.

Teacher tip

Equipment

Torch and materials for testing: a plastic brick. wooden block, glasses, glass jug, book, magnifying glass, tracing paper, clear plastic bag, rubber band (optional).

Content guidance

Exploration of objects

Supervision

Adult supervision recommended

Licence

This content is © Oak National Academy Limited (2026), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).