Документ взят из кэша поисковой машины. Адрес оригинального документа : http://hea-www.harvard.edu/~pgreen/educ/figs/wavemodel.ps Дата изменения: Thu Nov 30 18:31:35 2000 Дата индексирования: Tue Oct 2 07:11:39 2012 Кодировка: Поисковые слова: arp 220

Wave Model for light
Electromagnetic Wave
What Happens to the Wave When it Encounters the Small Opening?
What Will Happen to the Wave When it Encounters a Smaller Opening?
Diffraction: Bending of light when it passes around a sharp obstacle or through a narrow slit. Different
wavelengths (colors) of light diffract by different amounts.

What Will Happen to the Light After it Passes Through Two Slits?
Interference: Superposition of waves. Constructive interference occurs when waves reinforce each
other (as at point A above). Destructive interference occurs when light waves cancel each other.
Diffraction Grating has many narrow "slits". Your diffraction grating has about 20,000 "slits" etched
on the plastic.
How does a diffraction grating form a spectrum?
Light wave 1 performs exactly one more vibration (up­down cycle) than light wave 2 before striking
screen. Both light waves arrive in phase.
= Constructive Interference

What Causes the Colors in Soap Bubbles?
interior of soap bubble (air)
Light is reflected from both the top and the bottom surfaces of the bubble. Light Ray 2 travels extra
distance abc compared to light ray 1. If light waves 1 and 2 arrive at the eye in phase (constructive
interference), then you see a bright reflection. The colors you see depend on which wavelengths (colors)
are in phase when they reach your eye. What will this depend on?
Go to Light Energy and Color
Return to Light Index Page
Last modified: November 26, 1997
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