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19.1 & 19.2 (19.1 (Incoherent light is light with unsynchronized wave…
19.1 & 19.2
19.1
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Coherent light is light from two or more sources that add together in superposition to produce smooth wave fronts.
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19.2
Diffraction Pattern
Diffraction pattern is a pattern on a screen of constructive and destructive interference of Huygens’ wavelets.
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Interference of Coherent
Monochromatic light is used, which is light of only one wavelength.
- Bright bands of near spacing and near equal width
- The intensity of the bright bands decreases the farther the band is from the central band
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Polychromatic light is used, which is light of many wavelengths
- All wavelengths interfere constructively in the central bright band
- The positions of the other colored bands result from the overlap of the interference fringes that occur where wavelengths of each separate color interfere constructively.
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Thin film interference
The phenomenon of a spectrum of colors resulting from constructive and destructive interference of light waves due to reflection in a thin film, is called thin-film interference.
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Diffraction Gratings
is a device made up of many single slits that diffract light and form a diffraction pattern that is an overlap of single-slit diffraction patterns.
Diffraction gratings can have as many as 10,000 slits per centimeter. That is, the spacing between the slits can be as small as 10−6 m, or 1000 nm.
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