how light behaves at a boundary 17.1 how light behaves at a boundary how light behaves at a boundary...
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17.1 How Light Behaves at a BoundaryHow Light Behaves at a Boundary
HowHowlightlight
behavesbehaves atat aa boundaryboundary
By Victoria Skinner
law of reflection law of reflection *If 2 parallel beams strike a mirror 2 reflected
beams are also parallel
*If a line is perpendicular to a mirror it is the normal because it is normal to the surface.
*regular reflection- happens when light is reflected back to the observer in parallel beams *Diffuse reflection- the scattered, fuzzy reflection from a rough surface where light is reflected
reflectionsreflections
Refraction of light
Angle of refraction- the angle the refracted ray makes with the normal to the surface
Angle of Angle of refractionrefraction
Optically denseOptically denseOptically dense- materials with larger indices of refraction with respect to other materials
Snell’s lawSnell’s law• *Snell's law- states that the ratio of sine
of the angle of refraction is a constant
Incident Ray traveling in a less dense medium
index of index of refractionrefraction
• *index of refraction- the ratio of the speed of light in a vacuum to its speed in a material*
*The index of refraction often can be measured by directing a ray of light onto the substance's surface, measuring the angle of incidents and angle of refraction,then using Snell’s law..
problem solving strategies-• 1.draw a diagram showing 2 media and label • 2. Draw the incident ray • 3.use protractor • 4.use Snell’s law • 5.use protractor
• 6.evaluate.
*when solving problems involving refractions and reflections of light a one will use a ray diagram .
* when setting up a Snell's law problem assign symbols for the various quantities, and check your results.
Displacement Sensor Topic: Principle of Regular Reflection Measurement. OMRON Corporation , 2011. Web. 28 Feb. 2011. <http://www.omron-ap.co.th/FAQ/ FAQ01367/index.asp>. Dizzo95. "light refraction." 12 Nov. 2009. youtube. Web. 28 Feb. 2011. YouTube<http://www.youtube.com/watch?v=OdcHCRF00jM&NR=1>.
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Unit1_Light.html>.
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"Unit 2 Refraction of Light." Creative Commons Attribution Share-Alike 3.0 License. chemicalparadigms, 2011. Web. 28 Feb. 2011. ht
<http://https://chemicalparadigms.wikispaces.com/ Unit+2+Refraction+of+light>.
WORKS CITED
Weblog post. Analysing Refraction of Waves. Nuffnang Web. 28 Feb.2011. <http://fiziknota.blogspot.com/2008/03/ analysing-refraction-of-waves.html>.
Zitzewitz, Paul W, comp. Physics Principles and Problems. 2002 ed. New York: Glencoe, 2002. Print.