bands on dusty windows imaged
by Kevin Boyle. Images ©Kevin
shown with permission.
Optical effects are everywhere. Here, dust particles on the windows of
a garden shed produce a colour display. Light scattered by the dust and
reflected by the glass reaches us along two routes. The two sets of light
waves interact to produce coloured interference bands called Quételet fringes.
More about Quételet scattering here.