Refraction Flashcards
1
Q
Refraction: This occurs when a wave goes from
A
2
Q
one medium into another medium at an angle. The
A
3
Q
result is the wave’s velocity
A
wavelength & direction
4
Q
ALL change! Recall that frequency remains the
A
5
Q
same!
A
6
Q
deep side of
A
7
Q
ripple tank
A
8
Q
shallow side of
A
9
Q
ripple tank
A
10
Q
faster!
A
11
Q
2d
A
12
Q
slower!
A
13
Q
deep
A
d
14
Q
shallow
A
s
15
Q
va^
A
16
Q
What happens with velocity also happens
A
17
Q
with wavelength!
A
18
Q
This is true because frequency in both
A
19
Q
shallow and deep is the same!
A
20
Q
the harder something is the slower the light travels through
A
21
Q
- Note Practice Both Drawings
A
22
Q
Drawing refraction images are tricky. Here are two ways:
A
23
Q
Rays are always 90 from the wave
A
24
Q
fronts
A
25
SOR
26
R
27
Angles can be measured between the
28
Angles can be measured between the
29
wave RAY and the NORMAL
30
wave FRONT and the BARRIER.
31
if wavelength is bigger
32
the sPeed of the
33
angle of insadace =
34
Oi angle of refraction
35
nave is faster
36
1à Same with the angle
37
angle of reflection = Or
38
R
39
The Refraction Equation (sometimes called Snell's Law):
40
nall Law
41
E2 = medium 1
42
medium 2
43
=
44
V
45
2
46
1
47
2
48
Sin
49
Sin O2
50
Ex: A wave passes from shallow water to deep water. It is noticed
51
that the wavelength in shallow water is 1.5 cm while the
52
wavelength in the deep water is 3.0 cm. If the speed of the wave
53
in shallow water is 2.0 cm/s then what is the speed of the wave
54
in the deep water?
55
Step 1: Organice your given vales!
56
15 = 1. 5cm
57
Ad = 3.0 cm
58
+5/5
59
Vs = 2.0 cm/s
60
-?
61
3
62
Step 2. Choose the unknown to
63
be in mesium #1
64
20
65
* last step off doing thysices Ust the questone does this me
66
Ex: A ripple wave generated in a ripple tank is 3.4 cm long in shallow
67
water and is 5.5 cm long in the deep water. If the wave front strikes
68
the barrier at 25 degrees
what is the angle of refraction in the deep
69
water? Draw a diagram of the situation.
70
1= 3.4
71
OR
72
12 = 5.9
73
03 = 25°
74
da =?
75
deep
76
Shallow
77
2
78
SinG
79
Sin ta
80
5.3 - 5in0o
81
Sin 25°
82
S.S
83
3 = Sin Go
84
3.4
85
0.4226
86
What is the index of refraction in the above example?
87
inder = another word for rutior
88
ratio = 2 numbers divided by itself
89
=
90
(0.4226(5.5)
91
= Schi 0a =
92
-3.9
93
Gin Ga = 6.683 6(7155 Sia
94
3
0
95
Sinti
96
Sia Da
97
* any ratio is
98
Considered the inces
99
of refracton
100
index refiaction = n
101
n = 5.5 = 1.62
102
3.4
103
Find the angle of refraction when the angle of incidence in the shallow end
104
is 62 degrees in the above example.
105
5.5
106
Sin Gd
107
3.4
108
- Sin 620
109
S.5 = Sin 6i
110
3.4 0.8829
111
Sinta = 1.9823
112
Tin 1
113
Ed = error"
114
there
tr
115
notenough rome
116
to refract
117
# theres allways
118
There is o
119
refracto and only = TIR
120
a small anoint of
121
reAechen
122
* reflection
123
62
124
A have travels at 12 am/s in stillow water while traveling at
125
15 amls in deer water. If the have goes from shallow to deer at an angle
126
of 95"
calculate the expected angle at refration
127
15 =
128
Sin & d
129
Sime you start with a wide angle is
130
SiA 75°
131
can't jes bigger - error )
132
2
133
Sin Ad = (15) (Sin 35°)
134
deal
135
Shallow
136
S:n6d = 1.20>407288
137
Ad = error"
138
4 з
139
2
140
128
141
Oc - Critical
142
ang le
143
TIR is total Internal Readatin
144
(a) Nearsighted eye
145
(b) Farsighted eyes
146
SinGi =
147
1d ta
