# Interference

## Young’s Interference Experiment

Young’s Interference Experiment In 180 I, Thomas Young experimentally proved that light is a wave, contrary to what  most other scientists then thought. He did so by demonstrating that light undergoes interference, as do water waves, sound waves, and waves of all other types. In  addition, he was able to measure the average wavelength of …

## Diffraction

Diffraction In the next section we shall discuss the experiment that first proved that light is a wave. To prepare for that discussion. we must introduce the idea of diffraction of waves, a phenomenon that we explore much more fully in Chapter 37. Its essence is this: If a wave encounters a barrier that has an opening of …

## Wavelength and Index of Refraction

Wavelength and Index of Refraction We have now seen that the wavelength of light changes when the speed of the light  changes, as happens when light crosses an interface from one medium into another. Further, the speed of light in any medium depends on the index of refraction of the  medium, according to . Thus, the …

## The Law of Refraction

The Law of Refraction We now use Huygens’ principle to derive the law of refraction,  (Snell’s law).  shows three stages in the refraction of several wavefronts at a plane interface between air (medium I) and glass (medium 2). We arbitrarily choose the wavefronts in the incident light beam to be separated by A. , the wavelength in medium …

## Light as a Wave

Light as a Wave Sunlight, as the rainbow shows us, is a composite of all the colors of the visible spectrum. The colors reveal themselves in the rainbow because the incident wavelengths are bent through different angles as they pass through raindrops that produce  the bow. However, soap bubbles and oil slicks can also show striking colors, …

## Interference

Interference At first glance, the top surface of the Morpho butterfly’s wing is simply a beautiful blue-green. There is something strange about the color, however, for it almost glimmers, unlike the colors of most objects-and if you change your perspective, or if the wing moves, the tint of the color changes. The wing is said to. be iridescent. …