Explain why light is needed to see
The idea
A light source produces light; an ordinary object can reflect that light.
Step by step
- A light source produces light; an ordinary object can reflect that light.
- To see an object, light must travel from it into the eyes.
- In complete darkness, an unlit ordinary object cannot be seen.
Example
A switched-on flashlight produces light. What is the flashlight?
Answer
a light source
It produces its own light rather than only reflecting light from elsewhere.
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With an adult, shine a flashlight onto a toy in a dim box. Compare the view when the flashlight is off and on.
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