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Light Wave Properties Summary
Hinweis der Redaktion
- a. Snell's Law  n 1 sin ï± 1 = n 2 sin ï± 2  b. Critical angle ( Symbol: ï± c ) angle of incidence for which angle of refraction is 90° (as light passes from a medium (n) into air or a vacuum)  sin ï± c = 1/n  (from nsin ï± c = 1.00sin 90°)  c. Total internal reflection occurs when angle of incidence is greater than critical angle.  Examples : fiber optics sparkling diamond rainbow d. Dispersion separation of polychromatic light into its component wavelengths as the light enters a dispersive medium obliquely. Different frequencies (colors) of light travel at different speeds through a dispersive medium.  Red, blue, and green light make white  i. Dispersive medium A substance in which the speed of a wave depends on its frequency. Glass is a dispersive medium for light.  Examples : Diamond Rainbow Chandelier Prism  ii. Non-dispersive medium One in which the speed of the wave does not depend on the frequency. A vacuum is non-dispersive for light.