… is the way the room looks with a dozen rayboxes in use.
Tag Archives: optics
Optical fibres and transparent concrete
Total internal reflection allows optical fibres to carry light from one place to another. Optical fibres are used to carry data and for use in internal “keyhole” surgery.
LiTraCon in the US has now embedded optical fibres within poured concrete blocks, creating (partially) transparent concrete that’s just as strong as its non-transparent brother.
Optical phenomena
Environmental Graffiti has a great post about optical (light) phenomena; I’ve picked out a couple of my favourites:
Crepuscular Rays
Crepuscular rays are caused by the scattering of beams of light; beams created by an object such as a tree or a cloud.
Star Trails
Star trails are created when the shutter of a camera is left open for a long time (a matter of hours) and the Earth’s rotation causes the star to move through the sky, leaving a trail behind on the image. The trails are formed in circles around the North Star Polaris, (or the South Star Sigma Octanis in the southern hemisphere), the only star that appears stationary from Earth because it is directly above the axis of rotation.
Circumhorizon Arc
A circumhorizon arc is caused by the refraction of light through ice crystals in cirrus clouds; it’s a bit like a rainbow stuck in the sky.
5200mm lens
See that tiny blob on the right-hand side of the lens below? That’s a standard SLR camera!
Canon’s 5200mm lens weighs 99kg and can be used to take photographs of objects “between 18 and 32 miles away”!