CLEAN : Shanghai neighbourhoods barricaded as Covid cases mount

The video provides a brief introduction to the concept of shadow, explaining its basic idea.

What is a shadow?

• A reflection of light

• An area where light is blocked

• A type of light source

• A color in the spectrum

How is a shadow formed?

• By the blocking of light

• By the absorption of light

• By the reflection of light

• By the emission of light

Which of the following affects the size of a shadow?

• The temperature of the environment

• The speed of light

• The color of the object

• The distance from the light source

What happens to a shadow when the light source is moved closer?

• The shadow becomes smaller

• The shadow disappears

• The shadow becomes larger

• The shadow changes color

Which factor does NOT affect the shape of a shadow?

• The shape of the object

• The color of the light source

• The distance between the object and the surface

• The angle of the light source