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Key facts for this unit:

Light travels from a light source such a lamp or the Sun.

Light sources give out light.

We see things when light from a source enters our eyes.

Some objects seem bright, but they are only reflecting light from elsewhere.

Light travels in straight lines.

If something is in the way of the light you get a shadow.

Light travels very fast. 300 million metres a second.

Opaque objects block all light .

An opaque object blocking the light causes shadows eg. wood, metal, stone, you.

Transparent objects let light through eg. glass, clear plastic.

Translucent objects block some light eg. tissue paper