3B Scientific SEK Optics - Manual (Page 29)

Exercise
Examine how light reacts at the transition from glass to air!
What do we need?
1 Optical lamp
with power supply unit
1 Base plate
1 Screen
1 Semicircular glass object
(flat design)
1 Single-slot aperture
1 Mask
Conducting the experiment
1. Attach the mask to the screen!
2. Place the optical lamp on the left side of the base plate, so that the light emerges parallel to the
right!
3. Place the screen in front of the optical lamp! Insert the single-slot aperture into the aperture holder!
4. Place the semicircular glass object in the middle as marked on the mask!
5. Complete the column titles in the table!
6. Adjust an angle of incidence of α = 20° by changing the position of the optical lamp!
7. Determine the angle of refraction! Enter the measured values in the table!
8. Repeat the experiment with the following angles of incidence:
α = 30° (40°, 45 °, 50°, 60°)!
9. Compare the columns with the angles of incidence and the angle of refraction! Formulate a “the ...
the ...” statement!
10. Do you observe a special reaction starting at a certain angle of incidence? Explain!
ELWE Physical experiments for education in natural science and engineering
Repr
odu
c
ti
o
n
is
a
llo
w
ed
onl
y
fo
r
u
s
e
w
it
h
E
L
W
E
-e
qui
p
m
en
t.
1 SEG - OP 3.3 Refraction for the Transition from Glass to Air