Not only does light travel, it travels in straight lines through a given medium.

Physics Narrative 11-14

In 1666 Sir Isaac Newton studied the effect of passing a beam of light through a triangular glass prism. He completely...

Physics Narrative 11-14

Newton identified seven colours in the spectrum on his study wall:

Physics Narrative 11-14

An easier way to separate out light of different colours is to use coloured filters. For example, when white light passes...

Physics Narrative 11-14

The human eye does not detect frequencies directly. So when we see red, we do not necessarily see a narrow range of...

Physics Narrative 11-14

Combining three lamps covered with red, green and blue filters can make a whole range of colours.

Physics Narrative 11-14

Why does a red dress appear red in ordinary white light?

Physics Narrative 11-14

The outcome of mixing paint is not necessarily the same as mixing light. Let's consider one specific example: mixing yellow...

Physics Narrative 11-14

A white light source emits a whole range of frequencies. You can select some frequencies by filtering or by dispersion. These...

Physics Narrative 11-14