Wave behaviors reg
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Transcript of Wave behaviors reg
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Wave properties
Wavefront – a line joining points that are in phase
- the lines you see when ripples spread on water are wavefrontsRays – arrows drawn to show the direction of wave motion
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Reflection
- The bouncing of waves off a surface
Regular reflection – reflection from a smooth surface
- an image would appear to be coming from behind the surface
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Diffuse reflection – reflection from a non-smooth surface
- light bounces off the surface but no image can be seen
When light hits a surface, part of the wave is reflected, part is absorbed by the atoms of the material.
When light hits a transparent material, some is transmitted through the window.
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Law of reflectionThe angle of incidence equals the angle of reflection
All angles are measured to the normal line (perpendicular to the surface)
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Refraction
When a wave passes from one medium into another, its velocity changes. If the wave hits the boundary at an angle, the wave also changes direction.
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Index of refraction (n)- a number that relates the optical density of a substance (how fast light travels through it)
c = 3 x 108 m/sv = speed of light in substance n
Ex: What is the speed of light in water (n = 1.33)?
v = 2.26 x 108 m/s
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Light travels at 2 x 108 m/s in a substance. What is its index of refraction?
The index of refraction of a liquid is 0.80. How fast does light travel in it?
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Snell’s Law
= =
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A water wave travelling at 20 m/s enters a shallow region where its velocity is 15 m/s. If the angle of incidence of the water wave is 50o, what is the angle of refraction?
35.2o
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Light travelling through air is incident on the surface of a pool of water at an angle of 40o. Calculate the angle of refraction.
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