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      Lesson details

      Learning outcome

      I can explain how shadows are formed.

      Key learning points

      1. When light falls on some objects, a dark shape is formed on the other side of the object.
      2. A shadow is a dark shape that is formed when an object blocks light.
      3. Opaque objects do not allow light to travel through them.
      4. A shadow does not show the features of an object.
      5. The shape of a shadow depends on the shape of the object blocking the light.

      Keywords

      • Shadow - A shadow is a dark shape that is formed when an object blocks light.

      • Object - An object is something you can touch but something that is not usually a living thing.

      • Light source - Something that is a light source produces its own light.

      • Opaque - Light cannot pass through objects that are opaque.

      Common misconception

      Shadows contain details of the object, such as facial features of a human’s shadow. Also that a shadow can be a different shape to the object, and formed in between the light source and the object.

      Explanation of how shadows are formed.

      Teacher tip

      Make the classroom as dark as possible before creating shadows. A light box or an overhead projector work well for the tasks in this lesson.

      Equipment

      Torches and other light sources, paper or cardboard, scissors, tape, pencils or lolly sticks, a range of objects made from transparent, translucent and opaque materials for testing.

      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).

      Lesson video

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      Prior knowledge starter quiz

      6 Questions

      Q1.
      Alex is classifying materials by how much light they let travel through them. Which groups should he put them into?

      Correct answer: opaque, transparent and translucent
      rough and smooth
      waterproof and absorbent

      Q2.
      Which of these statements is true?

      Opaque materials let light pass through them.
      Opaque materials let some light pass through them.
      Correct answer: Opaque materials do not let light pass through them.

      Q3.
      Which of these images shows an object made from a transparent material?

      jug
      Correct answer: cup
      bathroom window

      Q4.
      True or false? Transparent materials do not let light travel through them.

      Correct Answer: false

      Q5.
      What kind of material does this image show?

      An image in a quiz
      opaque
      Correct answer: translucent
      transparent

      Q6.
      Which of these statements is true?

      We can see objects clearly through translucent materials.
      Correct answer: We can see objects through translucent materials but not clearly.
      We cannot see objects through translucent materials.

      6 Questions

      Q1.
      A shadow is formed on a surface when an object blocks ...

      heat.
      water.
      Correct answer: light.

      Q2.
      Which of these images shows a shadow?

      Correct answer: image 1
      image 2
      image 3

      Q3.
      Which word describes materials that do not allow light to travel through them?

      Correct Answer: opaque, Opaque

      Q4.
      Which of these objects is made from an opaque material?

      frosted glass window
      Correct answer: metal tin
      plastic cup

      Q5.
      The shape of a shadow depends on ...

      the size of the object that is blocking the light.
      Correct answer: the shape of the object that is blocking the light.
      the colour of the object that is blocking the light.

      Q6.
      Which of these statements are true?

      A shadow shows the features on an object.
      Correct answer: A shadow does not show the features on an object.
      A shadow is formed on the same side of the object as the light source.
      Correct answer: A shadow is the same shape as the object.
      Correct answer: A shadow is formed on the other side of the object as the light source.

      To help you plan your 3 science lesson on: Making shadows, download all teaching resources for free and adapt to suit your pupils' needs...