3B Scientific SEK Optics - Manual (Page 33)

Exercise
Examine how light reacts when it passes through a plane-parallel plate!
What do we need?
1 Optical lamp
with power supply unit
1 Base plate
1 Screen
1 Plane-parallel plate
1 Single-slot aperture
1 Mask
additionally required:
1 Ruler
2 Coloured pens
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!
4. Place the plane-parallel plate in the middle as marked on the mask!
5. Insert the single-slot aperture into the aperture holder!
6. Change the position of the lamp, so that the light from the optical lamp hits the plane-parallel plate
at an angle from the right!
7. Adjust an angle of incidence of
α = 30°! Draw the beam of light on the mask! Remove the glass
object!
Then extend the beam emerging from the glass object backwards
! Compare the directions of the
incident and the emerging beams of light! Measure the distance between the beams! Enter the
value in the table! Describe the trend in one sentence!
8. Repeat the experiment after increasing the angle of incidence of the light (40°, 50°)!
Use pens with different colours! Enter the measured values in the table!
9. Compare the direction of the incident light with the direction of the light emerging from the plate!
Measure the lateral displacement and describe a relation between the value for the angle of inci-
dence and the value for the lateral displacement!
10. Where in real applications does a lateral displacement of light occur?
ELWE Physical experiments for education in natural science and engineering
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1 SEG - OP 3.5 Light Curve on a Plane-parallel Plate