A glass is...
Transparent
Why do transparent objects not make good shadows?
They don't stop a lot of light.
How can I change a shadow's size?
Closer = bigger, far away=smaller
What surfaces are better reflectors: rough or smooth?
Smooth, like mirrors.
What happens to shadows made by the Sun during the day?
They change direction and shape.
A wall is...
Opaque
Why is the Moon not a light source?
Because it reflects the sunlight.
How do we see things?
Light travels from a light source, bounces off an object and gets to our eyes.
What happens when light gets to an opaque object?
If's blocked and forms a shadow.
Name the 3 things we need to make a shadow.
Object, light source, screen (surface).
How do mirrors work?
The light is reflected on their surface.