Suchergebnisse
Suchergebnisse:
Thin-film interference is a natural phenomenon in which light waves reflected by the upper and lower boundaries of a thin film interfere with one another, increasing reflection at some wavelengths and decreasing it at others. When white light is incident on a thin film, this effect produces colorful reflections.
This interference is between light reflected from different surfaces of a thin film; thus, the effect is known as thin-film interference. Its effects and applications are everywhere: in incredibly precise optical devices, anti-forgery measures, and in cameras and projectors. As described below, Katharine Burr Blodgett's pioneering invention of ...
This interference is between light reflected from different surfaces of a thin film; thus, the effect is known as thin-film interference. As we noted before, interference effects are most prominent when light interacts with something having a size similar to its wavelength.
This interference is between light reflected from different surfaces of a thin film; thus, the effect is known as thin film interference. As noticed before, interference effects are most prominent when light interacts with something having a size similar to its wavelength.
- What It Shows
- How It Works
- Setting It Up
- Comments
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 beautiful colors in white light, or dark and light bands in monochromatic light. Below are two videos of our dem...
Our two most visually dramatic illustrations of thin film interference use either a soap film suspended in air from a 19 cm diameter circular frame, or a very thin layer of oil floating on top of water.
The light box, the holder for the soap-film frame, and the video camera all occupy a demo cart. Their relative positions should be carefully arranged before lecture as the lighting, viewpoint, and choice of lens is crucial. Position both camera and light box approximately 45° relative to the plane of the soap-film; the background behind the soap fi...
If you would like to be a little more quantitative in the oil film experiment, you may wish to estimate the thickness of the film. This can be easily be done by measuring the volume of the drop (use a micro-pipet instead of an eyedropper) and the diameter of the circular oil slick. 1 Physical Science Study Committee, Physics, (D.C. Heath, 1960) Cha...
B24: Thin Film Interference. As the name and context imply, thin-film interference is another interference phenomenon involving light. Here’s the picture, as viewed from above: Involved are three transparent media: medium 1, medium 2, and medium 3, of index of refraction n1 n 1, n2 n 2, and n3 n 3, respectively.
This interference is between light reflected from different surfaces of a thin film; thus, the effect is known as thin film interference. As noticed before, interference effects are most prominent when light interacts with something having a size similar to its wavelength.
