Sunglasses are a common piece of optical technology. When we wear them we are looking through pieces of coloured transparent material. The light passes through the glasses, but is changed in some way so that what we look at is not as glaring.
How is light affected when it passes through pieces of coloured transparent material?
What to use
Pieces of dark-coloured cellophane (red, green, blue or violet) or use the coloured filters from a light box set, light box with coloured filters, white cardboard screen, a room which can be brightly lit as well as darkened, a set of coloured cardboard pieces (red, yellow, green, blue, violet and white).
What to do
A Looking through cellophane
- In the well-lit room, look through the cellophane (or the filter from the light box) at each of the pieces of coloured cardboard. Does the colour of the cellophane (filter) affect what you see? Does the colour of the cardboard square seen through the cellophane differ if different colours of cellophane are used?
- Try each colour of cellophane (filter) with each of the coloured squares.
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