3B Scientific Basic Optics Kit (115 V, 50__60 Hz) - Manual (Page 2)

Optics / Experiment 7 Work sheet 3B STUDENT Kit
2
Procedure
1) Observe the path of the ray of light.
0 5 10 20 30 15 25 35
0
1 0
2 0
30
40
50 60 70 80 90 80
70
60
50
4 0
3
0
2
0
10
0
1
0
2 0
30
40
50 60 70 80 90 80
70
60
50
4 0
3
0
2
0
10
Figure 2
2) Now turn the experiment table in such a way that the ray of light falls along the 10° mark (angle of inci-
dence
α) and falls on the 0° line on the semicircular body (please see Figure 2).
3) Read off the angle at which the ray of light emerges from the semicircular body (angle of refraction
β) and
the angle at which the ray of light is reflected (angle of reflection
γ), and enter these values in the table.
4) Turn the table slowly around the center of the circle in steps of 10°, up to 70°, and in each case, note down
the angle of emergence and the angle of reflection in the table. Make sure that the ray of light falls as accu-
rately as possible on the respective degree mark and hits the semicircular body on the 0° line.
5) Using the pocket calculator, calculate the values sin
α and sin β in each case, and enter them in the table.
6) In each case, find the quotients
β
α
sin
sin
and note them down in the table. Round off to the second decimal
place.
7) Compare the quotients
β
α
sin
sin
in the table.
Measurement table:
Angle of incidence
α
Angle of emergence
β
Angle of reflection
γ sin α sin β
β
α
sin
sin
10° 6.5° 10° 0.17 11 1.54
20° 12.5° 20° 0.34 22 1.54
30° 19° 30° 0.50 33 1.52
40° 25.5° 40° 0.64 43 1.49
50° 30° 50° 0.77 0.50 1.54
60° 35° 60° 0.87 57 1.53
70° 39° 70° 0.94 63 1.49