The document discusses three categories of objects - transparent, translucent, and opaque - and asks why certain properties are important for each. Transparent objects allow clear visibility, translucent objects only partially block light, and opaque objects do not allow any light through. Students are asked to sort objects into these categories and create a poster showing their findings.

1. Transparent objects allow you to see clearly
through them. Some examples are:
Why is it important for these objects to be
transparent?

2. Translucent objects only let some light through
them. You cannot see clearly through a
translucent object. Some examples are:
Why don’t we have to see through these objects?

3. Opaque objects do not let any light through them.
You cannot see through them. Some examples of
opaque objects are:
Why is it important that these objects are opaque?

4. In groups can you sort the objects on your table
into transparent, translucent and opaque? Make a
poster to show what you have found out.