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Ch. 19 - Light III. Wave Properties of Light (p.546-550) Reflection Refraction Diffraction Interference
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A. Reflection Reflection when a wave strikes an object and bounces off incident beamreflected beam Normal
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A. Reflection Law of Reflection the angle of incidence equals the angle of reflection
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B. Refraction Refraction bending of waves when passing from one medium to another caused by a change in speed slower (more dense) light bends toward the normal SLOWER FASTER faster (less dense) light bends away from the normal
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B. Refraction Refraction depends on… speed of light in the medium wavelength of the light - shorter wavelengths (blue) bend more
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B. Refraction Example: View explanation.explanation.
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C. Diffraction Diffraction bending of waves around a barrier longer wavelengths (red) bend more - opposite of refraction
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D. Interference Interference constructive brighter light destructive dimmer light
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E. Cool Applications! Fiber Optics Total Internal Reflection when all light is reflected back into the denser medium
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E. Cool Applications! The “Broken Pencil” refraction View animation and explanation of the “Broken Pencil.”animation and explanation of the “Broken Pencil.”
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E. Cool Applications! Rainbows refraction-reflection-refraction
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E. Cool Applications! Diffraction Gratings glass or plastic made up of many tiny parallel slits may also be reflective spectroscopes, reflective rainbow stickers, CD surfaces
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E. Cool Applications! Thin Films - Bubbles & Oil Slicks interference results from double reflection
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E. Cool Applications! Blue Sky & Red Sunsets NOON less atmosphere less scattering blue sky, yellow sun SUNSET more atmosphere more scattering orange-red sky & sun Molecules in atmosphere scatter light rays. Shorter wavelengths (blue, violet) are scattered more easily.
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