The Spectrum

What it shows:

The full spectrum of colors (including white) in a television picture is produced by the additive mixing of only three colors: red, green, and blue.

How it works:

In a color television tube, three separate electron beams are focused so as to...

What it shows:

All colors can be created from a combination of the three primary colors of red, green and blue. The secondary colors of cyan, magenta and yellow are created from a combination of two primaries, and white light is perceived from the...

The experiment addresses questions like "Does color inhere in the world, or in the eye?" It is a re-creation of Edwin Land's retinex theory experiment.

What It Shows

Color is not actually a property of light or of objects that reflect light; it is a...

See how objects of different temperature emit different intensities of infra-red radiation.

What It Shows

The Long Wave Infra-Red (LWIR) camera is sensitive to wavelengths in the 7µm-14µm range. The output of the camera is NTSC...

What it shows:

Like visible light, invisible infra-red radiation can be refracted by lenses to produce an image on a screen. Indeed, a slide projector designed for visible light is used as the imaging device; a heat- sensitive screen makes the invisible...

Detection of IR radiation from hair dryer and/or special IR source.

What it Shows:

Detection of infra-red radiation by the rotation of a paddle-wheel vane inside a low pressure flask.

How it Works:

A radiometer consists of a partially evacuated flask...

What it shows:

White light is shown, á la Newton's demonstration of dispersion by a prism, to be composed of a continuous spectrum of colors.

How it works:

A large brilliant spectrum is produced by using a 1 kW carbon arc light source ¹ with adjustable...