WAVES WAVE INTERACTIONS FOUR WAYS WAVES INTERACT R-R-D-I REFLECTION REFRACTION DIFFRACTION...
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Transcript of WAVES WAVE INTERACTIONS FOUR WAYS WAVES INTERACT R-R-D-I REFLECTION REFRACTION DIFFRACTION...
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WAVES
WAVE INTERACTIONS
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FOUR WAYS WAVES INTERACT
R-R-D-IREFLECTIONREFRACTIONDIFFRACTIONINTERFERENCE
How waves interact with a medium
How waves interact with other waves
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LAW OF REFLECTION
Angle of incidence = angle of reflection
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Incident rays and reflected rays make equal angles with a line perpendicular to the surface, called the normal.
• The angle between the incident ray and the normal is the angle of incidence.
• The angle between the reflected ray and the normal is the angle of reflection.
• Angle of incidence = Angle of reflection
29.2 The Law of Reflection
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Diffuse reflection allows us to see most things around us. a. Light is diffusely reflected from paper in many directions. b. Light incident on a smooth mirror is only reflected in one
direction.
29.4 Diffuse Reflection
Ordinary paper has a rough surface when viewed with a microscope.
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As a light wave passes from air into water, its speed decreases.
29.8 Refraction of Light
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The extent to which the water waves bend depends on the size of the opening.
31.1 Diffraction and Huygens’ Principle
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Concave mirror causes light rays to diverge.
Convex mirror causes light rays to converge.
CONCAVE AND CONVEX MIRRORS
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REFLECTION
The bouncing back of a wave when it meets a surface or boundary.
http://www.gmi.edu/~drussell/Demos/reflect/reflect.html
http://www.physicsclassroom.com/mmedia/optics/lr.html
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REFRACTION
The bending of a wave as it passes from one medium to another.
http://www.physicsclassroom.com/mmedia/optics/lr.html
Light from pencil moves from air to your eye, through water and glass to your eye, through plastic to your eye
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Using diffraction gratings
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DIFFRACTION
The bending of a wave as it passes through an opening or by an edge.
Ex.: Hear a voice from around the corner.
http://www.pa.op.dlr.de/acoustics/essay1/beugung_en.html
http://www.infoline.ru/g23/5495/Physics/English/waves.htm
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INTERFERENCE
The combination of two or more waves that exist in the same place at the same time.
Constructive Interference (additive effect—in phase)
Destructive Interference (subtractive effect—out of phase)
http://users.erols.com/renau/wave_interference.html
http://www2.biglobe.ne.jp/%7Enorimari/science/JavaEd/e-wave3.html
http://www2.biglobe.ne.jp/%7Enorimari/science/JavaEd/e-wave2.html