Ray Box Investigations For Reflection - Refraction and Total Internal Refraction

1
Ray Box InvestigationsForReflection -
RefractionandTotal Internal Refraction

• Created for CVCA Physics
• By
• Dick Heckathorn
• 29 May 2K3

2
1
2
30o
30o
60o
60o
3
3
Image
Draw Line
Mirror
Pin
2
4
3
1
4
Image
Mirror
Pin
Object
5
P.A.
F
f
6
(No Transcript)
7
Add circularmirror
8
N
5
i
r
Measure angle i and angle r.
Both 0o
9
5
N
300
i
r
19.50
Measure angle i and angle r.
10
N
6
600
i
r
35.30
for both angles
Calculate
Measure angle i and angle r.
11
Calculate
for both angles.
What value did you get?
It should be near 1.50
It is called the index of refraction for the
plastic.
12
N
750
40.10
Draw an incident ray of 75o.
Calculate the angle of refraction.
Test your drawing with a light ray.
Draw the refracted ray.
13
300
600
35.30
19.50
14
N
7
15
N
Bent away/toward normal?
Calculate angle of refraction
Draw the refracted ray
Use light ray to check.
30.90
30.90
200
8
16
n1 sin ?1 n2 sin ?2
It tells us which way the refracted ray bends.
Does it all!!!
What does it do?
How?
The bigger n has the smaller sin ? and thus
the smaller ? (angle).
17
N
Bent away/toward normal?
Calculate angle of refraction
Draw the refracted ray
Use light ray to check.
74.60
74.60
400
9
18
N
Bent away/toward normal?
Calculate angle of refraction
Now what do we do?
Use light ray to check.
Tilt!!
600
600
10
19
N
What happens here?
750
750
11
20

• Demonstrations
• T.I.R. Plastic
• T.I.R. Water
• T.I.R. Glass Tube
• Ball in/out of Water
• Mugs

21
N
22
300
Calculate angle of refraction
Draw the refracted ray.
Which way is ray bent?
19.70
Calculate angle of refraction
Which way is ray bent?
Check with ray box.
Draw the refracted ray.
12
300
23
13
620
620
50
Calculate angle of refraction
7.50
Calculate angle of refraction
24
130
18.20
280
19.70
15
130
18.20
280
19.70
14
Calculate angle of refraction
Calculate angle of refraction
Calculate angle of refraction
Calculate angle of refraction
25
18
26
Thats All Folks!!