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Refraction Power- Point Power Point 10-3

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## Refraction Power- Point Power Point 10-3

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**Refraction Power-Point**Power Point 10-3**Definition**• Refraction- the bending of a wave or particle as it passes from different mediums**Application**• A fish appears higher than it actually is…**Bending Toward the Normal**• When light goes from a less dense to more dense medium, it is bent toward the normal. This is an example of air going to fiberglass.**Bending Away from the Normal**• When light passes fromfiberglassto air, it bends away from the normal.**The index of refraction (n)**• The speed of a wave is slower in a more optically dense medium.**A relationship…**• The relationship between the index of refraction (n) and the speed of the wave can be determined by • Example 1: What is the speed of light in a diamond (n=2.42)? where c=3 X 10 8m/s**Snell’s Law**• There is a mathematical relationship between: • n= index of refraction for a material • Angle of incidence • Angle of reflection Example 2: What is the angle of refraction of light going at an angle of 10 o from a diamond (n=2.42) to air (n=1.0)?**Total Internal Reflection**• Only occurs when light goes from more dense to less dense. • Three cases: • (1) Refracts- bends away from normal (o-43o) • (2) Critical angle- prism • (3) Reflection • Example 3: What is the maximum angle of incidence in a diamond where refraction occurs? (the angle of refraction is 90o or the critical angle)**Applications of Refraction**• Fiber optics, polar bear skin, sparkling of diamonds**Example 4: Double Refraction**• A layer of oil (n=1.45) floats on water (n=1.33). A ray of light has an incident angle with the oil of 40o. What is the angle that the ray travels in water?**Equilateral Triangle Prism**• Since speed of wave is slowing in glass (n=1.52) • Red is longest wavelength (700 nm); lowest frequency; bends the least. • Violet is the highest wavelength (400 nm); highest frequency; bends the most.**Example 5:Angles in Equilateral Triangle**• It is observed experimentally that the angle resulting in a prism is 41.5 o in crown glass (n=1.52). Determine the angles in the diagram provided.