Transcript
1.2 Analyzing Reflection Of Waves
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Learning outcomes
• Describe the reflection of waves in terms of the angle of incidence, angle of reflection, wavelength, frequency, speed and direction of propagation.
• Draw a diagram to show reflection of waves.
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Vibrating motor
Tank
White paper
Power pack (0-12 V AC/DC)RIPPLE TANK
Light Source
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Reflection of waves
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Law of reflection
• Incidence Wave, Reflected Wave and Normal Are Located at the same plane
• Angle of incidence = angle of reflection
For reflection of water waves,
i = r ; λλ i = λλ r ; f i = f r ; vi = vr
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Reflection of water waves observed using ripple tank
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Incidence Wave
Reflected Wave
Reflector
λλ incidence = λλ reflected; f incidence = f reflected
V incidence = V reflectedwww.myfunphysicsworld.blogspot.com
Incidence Wave
Reflected Wave
Plane Reflector
Angle of incidence, i = angle of reflection,r
normal
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More example…
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Reflected Circular Wave
Incidence Plane Wave
Curved Reflector
(Concave)
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Quick Review 1.2 Page 15Question 2
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(Homework 1) Quick review 1.2 (Page 15)
1) What is the relationship between the angle of incidence and the angle of reflection when light rays are reflected by a plane mirror?
angle of incidence = angle of reflection
2) Complete the diagram given which illustrates water waves reflected by a straight aluminium barrier.
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Incidence Wave
i
r
Reflected Wave
i = r
λλ i = λλ r
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No. Velocity depends on the depth.Velocity is the same because the depth of water is the same.
same.
increases
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i = r ; λλ i = λλ r ; f i = f r ; vi = vr
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