Waves wrap up
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Waves Wrap-Up. Miranda Calandro Spring 2011. Warm up. Go to the online textbook and open chapter 14 Complete problems 15-19 on p. 386. Behaviors of Waves. Interference – two waves occupy the same space at the same time Constructive – combine to produce a larger wave

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Waves Wrap-Up

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Waves wrap up

Waves Wrap-Up

Miranda Calandro

Spring 2011


Warm up

Warm up

  • Go to the online textbook and open chapter 14

  • Complete problems 15-19 on p. 386


Behaviors of waves

Behaviors of Waves

  • Interference – two waves occupy the same space at the same time

    • Constructive – combine to produce a larger wave

    • Destructive – waves subtract from each other or cancel each other out completely


Waves wrap up

  • Reflection – a wave strikes an object and bounces off


Types of reflection

Types of Reflection


Total internal reflection

Total Internal Reflection

  • The critical angle of incidence has been exceeded; a wave (light) strikes an object and is continually reflected throughout a material.

  • Ex.: Fiber optic cable


Critical angle

Critical Angle

  • Θc = n2/n1

  • For air, sinθc = 1/n1


Example 1

Example 1

  • The index of refraction for water is 1.33. Above the water is air. What is the critical angle of incidence for light starting inside the water and passing into the air above it?


Example 2

Example 2

  • A diamond with an index of refraction of 2.42 is surrounded by air. If a ray of light originating inside the diamond strikes the surface of a facet at an angle of 27 degrees from the normal, will the ray be refracted or will it experience total internal reflection?


Diffraction

Diffraction

  • Diffraction – a wave passes through an opening and bends and changes direction


Waves wrap up

  • Refraction - waves bend and change directions and speed when they travel from one medium into another


Law of refraction snell s law

Law of Refraction (Snell’s Law)

  • n1 sinθ1 = n2sinθ2

  • n=index of refraction (different for every medium)

  • n(air) = 1.00


Example 11

Example 1

  • A ray of light passes through air and strikes a piece of glass at an angle of 45 degrees from the normal. If the index of refraction of glass is 1.60, what will be the angle of refraction?


Example 21

Example 2

  • Light passes through air and strikes the surface of a piece of glass at an angle of 58 degrees from the normal. The angle of refraction is 33 degrees measured from the normal. Calculate the index of refraction for the glass.


Polarization of light

Polarization of Light

  • When light passes through two polarized filters perpendicular to each other, light is completely blocked.


Doppler effect

Doppler Effect

  • Change in frequency perceived by an observer moving relative to a wave source.


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