When unpolarized light is reflected from a non-metallic surface, the reflected ray is plane polarized parallel to the reflecting surface if
θi + θr = 90°
or
tanθi = n
where θi = incident ray (Brewster's angle), θr = refracted ray, n =...
Detection of IR radiation from hair dryer and/or special IR source.
Detection of infra-red radiation by the rotation of a paddle-wheel vane inside a low pressure flask.
A radiometer consists of a partially evacuated flask...
What it shows: A room-size laser interferometer with audio signal output. A standing wave is produced whenever a wave is reflected back on itself. A resonant cavity requires a second reflection so that the twice reflected wave has the opportunity to be...
Polaroid filters absorb one component of polarization while transmitting the perpendicular components. The intensity of transmitted light depends on the relative orientation between the polarization direction of the incoming light and the...
Simulation of atmospheric scattering and polarization of sunlight using slide projector and aquarium containing milky water.
Video of our demo in action https://youtu.be/y0dhFCsKomk
Unpolarized light passing through a fluid is scattered...
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.
In a color television tube, three separate electron beams are focused so as to...
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...
Normally isotropic substances can become birefringent when under stress. This property can be used in stress analysis.
To use birefringence in stress analysis, the sample is placed between two crossed Polaroids. The first...
A linear polarizing filter followed by a quarter-wave plate whose slow and fast axes are at 45° to the axis of the polarizer becomes a circular polarizing filter, and incident unpolarized light emerges as circularly polarized light. This...
Waves reflecting from two surfaces can interfere constructively and destructively. In this case it is light waves that are being reflected from the front and rear surfaces of thin soap or oil films. The interference produces a pattern of...
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.
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.
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The Long Wave Infra-Red (LWIR) camera is sensitive to wavelengths in the 7µm-14µm range. The output of the camera is NTSC...
