1. 17.1 How Light Behaves at a Boundary
By Victoria Skinner
Light travels in a straight line and at very high velocities.
*Its velocity varies depending on the medium it moves through.
17.1 How Light Behaves at a Boundary

2. 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.

3. *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
reflections
*There are not always  reflected beams sometimes there are just fuzzy dots such as when a surface is smooth and not transparent.

4. Refraction of light

5. Angle of refraction Angle of refraction- the angle the
refracted ray makes with the normal to
the surface

6. Optically dense Optically dense- materials with larger
indices of refraction with respect to other
materials

7. Snell’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

8. index of refraction *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..

9. 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.
When light passes through a medium it is reflected or refracted.
*The degree to witch the light is bent depends on the angle of incidence and the properties of the medium.
*On can find how the angle of refraction depends on the angle of incidence by using the Snell's law

10. WORKS CITED
Displacement Sensor Topic: Principle of Regular Reflection Measurement. OMRON Corporation , Web. 28 Feb < ap.co.th/FAQ/ FAQ01367/index.asp>.
Dizzo95. "light refraction." 12 Nov youtube. Web. 28 Feb YouTube<
"Light and Geometric Optics." OoCities.org. , Oct Web Feb.2011.< Unit1_Light.html>.
"Refractometers." Lab Safety Supplies. GHC Specialty Brands,, Web Feb <
"Unit 2 Refraction of Light." Creative Commons Attribution Share-Alike License. chemicalparadigms, Web. 28 Feb ht < Unit+2+Refraction+of+light>.
Weblog post. Analysing Refraction of Waves. Nuffnang Web. 28 Feb < analysing-refraction-of-waves.html>.
Zitzewitz, Paul W, comp. Physics Principles and Problems ed. New York: Glencoe, Print.