# diffraction-and-interference-chapter-31-hewitt-presentation-1213361235

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## Presentation Description

Interference and diffraction

## Presentation Transcript

### Thin-Film Interference:

Thin-Film Interference Requires the thickness of a very thin surface to vary from the top to the bottom. When the light reflects off the front surface is a multiple of ¼ of the wavelength of the light reflecting of the back surface, the waves interfere to reinforce a specific color. The colors change as the thickness of the film changes, and the ¼  is met at different locations for different colors.

### Two-Slit Interference:

Two-Slit Interference When light passes through two parallel slits, the light is diffracted, and spreads out. The spreading light resulting from each slit overlaps. A pattern of alternating bright and dark bands forms on an observing screen, resulting from constructive and destructive interference of light waves from the two slits.

### Effects of Changing Wavelength and Source Distance:

Effects of Changing Wavelength and Source Distance

### Effect of Wavelength on Interference Effects:

Effect of Wavelength on Interference Effects The nodal and anti-nodal lines spread farther apart as the wavelength gets larger

### Effect of Distance On Interference Effects:

Effect of Distance On Interference Effects The nodal and anti-nodal lines spread farther apart as the sources come closer together.

### Two-Slit Interference Pattern:

Two-Slit Interference Pattern

### Diffraction:

Diffraction The bending of light around an obstacle or through a small opening. Because wavelengths of light are so small, you usually don’t see light diffraction. The interference patterns are very small. Diffraction grating – a piece of glass or plastic with thousands of parallel slits placed very close together.

### Example of Diffraction:

Example of Diffraction