1.2 reflection

1.2 Analyzing Reflection Of Waves

www.myfunphysicsworld.blogspot.com

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.


Vibrating motor

Tank

White paper

Power pack (0-12 V AC/DC)RIPPLE TANK

Light Source


Reflection of waves


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


Reflection of water waves observed using ripple tank


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


More example…


Reflected Circular Wave

Incidence Plane Wave

Curved Reflector

(Concave)


Quick Review 1.2 Page 15Question 2


(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.


Incidence Wave

i

r

Reflected Wave

i = r

λλ i = λλ r


No. Velocity depends on the depth.Velocity is the same because the depth of water is the same.

same.

increases


i = r ; λλ i = λλ r ; f i = f r ; vi = vr


1.2 reflection

Documents

reflected f incidence

sameplane angle of incidence

reflection of waves

f reflectedv incidence

angle of reflection2

reflection ofwaves

depth of water

wave andnormal