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By Victoria Skinner. 17.1 How Light Behaves at a Boundary. How. light. behaves. a. at. boundary. 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.
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By Victoria Skinner 17.1 How Light Behaves at a Boundary How light behaves a at boundary
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 reflections
Angle of refraction Angle of refraction- the angle the refracted ray makes with the normal to the surface
Optically dense Optically dense- materials with larger indices of refraction with respect to other materials
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
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..
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.
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