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. - PowerPoint PPT Presentation

Transcript of Refraction Power- Point Power Point 10-3

Page 1: Refraction Power- Point Power Point 10-3

Refraction Power-PointPower Point 10-3

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DefinitionRefraction- the bending of a

wave or particle as it passes from different mediums

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ApplicationA fish appears higher than it actually is…

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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.

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Bending Away from the NormalWhen light passes from fiberglass to air, it bends

away from the normal.

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The index of refraction (n)The speed of a wave is slower in a more

optically dense medium.

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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)?

v =cn

where c=3 X 10 8 m/s

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Snell’s LawThere is a mathematical relationship between:

n= index of refraction for a materialAngle of incidenceAngle of reflection

n1 sinθ1 = n2 sinθ2Example 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)?

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Total Internal ReflectionOnly 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)

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Total Internal Reflection

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Applications of RefractionFiber optics, polar bear skin, sparkling of

diamonds

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Lab…Semicircular Prisms

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Rectangular Prism

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Right Triangle Prism

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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?

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Equilateral Triangle PrismSince 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.

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Pink Floyd…Which is correct?

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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.