2. 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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3. Light Source
Tank
White paper
Vibrating
motor
RIPPLE TANK Power pack (0-12 V AC/DC)
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6. 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 ; λi = λ r ; f i = f r ; vi = v r
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20. (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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21. Incidence
Wave
i=r
i
r
λi = λr
Reflected
Wave
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22. same.
increases
No. Velocity depends on the depth.Velocity is the same
because the depth of water is the same.
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23. i = r ; λi = λ r ; f i = f r ; vi = vr
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