The document discusses light sources and how we see objects. It explains that the moon, water, and mirrors are not light sources themselves but rather reflect light from other sources. It also defines transparent, translucent, and opaque objects based on how much light they allow to pass through. Finally, it notes that white light is actually a mixture of all the colors, which can be separated using a prism into the colors of the visible spectrum.

4. Are these light sources?
moon
water
mirror
These items are not light sources, instead they
are reflecting light from other sources.

5. How do we see?
 Light from a
luminous object
goes straight into
our eyes.
 Light from a
luminous object
reflects off a
non-luminous
object and into
our eyes.

9. Transparent objects allow you to see clearly
through them. Some examples are:

10. Translucent objects only let some light through
them. You cannot see clearly through a
translucent object. Some examples are:

11. Opaque objects do not let any light through them.
You cannot see through them. Some examples of
opaque objects are:

13. What colour is light?
• The white light we see is actually a mixture of
different colours. With a prism, we can
separate White light into its component
colours (red, orange, yellow, green, blue,
indigo and violet).