eduMedia is going free during the Covid-19 crisis. Click here ⚠
An animation to create day and night!
This photomontage allows you to turn on or off various light sources. We distinguish primary sources (the sun, the stars, or a lamp) and the secondary sources (the Moon or any reflecting object).
We also illustrate that shadows only appear in contrast to the supplementary light created by a source.
Click on a street lamp to switch it on/off.
Click on the Moon the same way.
- To illustrate different kinds of light sources and their corresponding effects on a scene.
- To explain how light sources cast shadows.
- To study the three elements of a shadow: the light source, the object, and the projection surface.
- To understand that shadows can only appear by contrast.
- To predict which one of the light sources will create a specific shadow.
- To analyze the rectilinear path of light in order to explain a shadow.